Introduction

Approximately 110 million patients visit emergency departments (EDs) in the United States every year, and 0.5% to 8% of these patients leave before they are seen by ED staff (1).

Leaving the ED without treatment (LWOT) can have serious consequences for both patients and hospitals, including:
1. Decrease in patient satisfaction
2. Decrease in patient safety
3. Hospital liability
4. Lost revenue for the hospital (ED facility fees, inpatient admissions, etc.) (2)

Long perceived waiting time is the most common reason for leaving, but other factors also play a part (3).

Various strategies have been proposed for reducing the occurance of LWOT, such as rounding within the ED waiting room to allay waiting time concerns (2).

This project proposes a model that identifies the likeliest patients to leave without treatment so waiting room rounding efforts can be more focused.

The Dataset

The dataset used in this analysis is from Christiana Care Health System, a large regional integrated health care system headquartered in Newark, Delaware. It contains data for all ED visits (approximately 196,000) made to the three emergency rooms run by CCHS for the year 2016. The data has been deidentified with regard to variables that directly identify a patient (name, account number, etc.), but it has not been deidentified with regard to visit dates and times. For that reason the source data should not be shared outside the Value Institute.

A complete data dictionary is provided in the Excel file containing the dataset.

The dataset is approximately 40 megabytes in size.

## Force the definition of data types inorder tp speed up loading of data.
dataclasses <- c("text", "text", "text", "text", "date", "date", "date", "date", "text", "date", "date", "date", "text", "text", "text", "text", "text", "text", "text", "text", "text", "text", "text", "numeric", "text", "text", "text", "text", "text", "text", "text", "text")

## Read the Data tab of the Excel file into a dataframe
sourcedata <- read_excel(sourcepath, sheet = "Data", col_types = dataclasses)

Exploring the Dataset

The structure of the dataset looks like this:

## Classes 'tbl_df', 'tbl' and 'data.frame':    195726 obs. of  32 variables:
##  $ LeftWithoutTreatmentIndicator: chr  "0" "0" "0" "0" ...
##  $ ODSVisitID                   : chr  "PHI" "PHI" "PHI" "PHI" ...
##  $ EDVisitID                    : chr  "PHI" "PHI" "PHI" "PHI" ...
##  $ AccountNumber                : chr  "PHI" "PHI" "PHI" "PHI" ...
##  $ EarliestDateTime             : POSIXct, format: "2016-04-12 07:18:00" "2016-04-12 07:32:00" ...
##  $ ArrivalSigninDateTime        : POSIXct, format: "2016-04-12 07:18:00" "2016-04-12 07:32:00" ...
##  $ FullyRegisteredDateTime      : POSIXct, format: "2016-04-12 08:06:00" "2016-04-12 08:58:00" ...
##  $ EnteredEDDateTime            : POSIXct, format: "2016-04-12 07:38:50" "2016-04-12 07:46:59" ...
##  $ Facility                     : chr  "WED" "CCH" "WED" "WED" ...
##  $ DoctorSawDateTime            : POSIXct, format: "2016-04-12 07:39:07" "2016-04-12 08:32:15" ...
##  $ NurseSawDateTime             : POSIXct, format: "2016-04-12 08:02:50" "2016-04-12 08:41:00" ...
##  $ LeftEDDateTime               : POSIXct, format: "2016-04-12 09:08:15" "2016-04-12 21:57:34" ...
##  $ ArrivedVia1                  : chr  "24" "18" "24" "18" ...
##  $ ArrivedVia2                  : chr  NA NA NA NA ...
##  $ TriageClass                  : chr  "7" "6" "8" "7" ...
##  $ TriageSeverityID             : chr  "4" "3" "4" "2" ...
##  $ ProcDesc                     : chr  "Right Sided Weakness And Arm Pain X 2 Days" "Slip And Fall, Back Pain, Unk Loc, Hematuria" "Rash To Right Leg X 4 Days" "R Back Pain X 1 Day/Dizziness" ...
##  $ PayerType                    : chr  "Unknown" "Medicare" "Medicaid" "Commercial" ...
##  $ FamilyDoc                    : chr  NA "12472" "11018" "3264" ...
##  $ Phone                        : chr  "PHI" "PHI" "PHI" "PHI" ...
##  $ HasPhone                     : chr  "YES" "YES" "YES" "YES" ...
##  $ PatientPersonID              : chr  "PHI" "PHI" "PHI" "PHI" ...
##  $ Zip                          : chr  "19801" "19701" "19809" "19703" ...
##  $ AgeInYears                   : num  50 71 25 46 37 28 11 61 58 61 ...
##  $ GenderID                     : chr  "2" "1" "1" "1" ...
##  $ EthnicCode                   : chr  "NHL" "NHL" "NHL" "NHL" ...
##  $ RaceCode                     : chr  "BL" "WH" "AS" "AI" ...
##  $ PrimaryLanguageCode          : chr  "EN" "EN" "EN" "EN" ...
##  $ MaritalStatus                : chr  "S" "S" "M" "M" ...
##  $ ReligionCode                 : chr  "BAP" "BAP" "OTH" "NON" ...
##  $ EmailAddress                 : chr  "PHI" "PHI" "PHI" "PHI" ...
##  $ HasEmailAddress              : chr  "NONE" "NONE" "YES" "NONE" ...

Five of the 32 columns containing only the text “PHI” are all related to variables representing a patient’s deidentified “personal health information”. These variables can all be ignored and will be dropped from further analysis.

The first column, which is labeled LeftWithoutTreatmentIndicator, is the target variable that needs to be predicted. A “1” indicates the patient left before treatment, a “0” indicates they did not.

Below is a summary of the values found for the categorical variables in the dataset:

## $LeftWithoutTreatmentIndicator
##   x   freq
## 1 0 187018
## 2 1   8708
## 
## $ArrivedVia1
##       x  freq
## 1     1  7411
## 2    18 45468
## 3    19   128
## 4     2    20
## 5    20   162
## 6    21  5955
## 7    22  2173
## 8    23 52358
## 9    24 61956
## 10    3    24
## 11    4   273
## 12    5  8133
## 13    6  9884
## 14    7   791
## 15 <NA>   990
## 
## $ArrivedVia2
##            x   freq
## 1  Ambulance   7411
## 2        Bus     20
## 3 Helicopter     24
## 4      Other    791
## 5     Police    273
## 6   Relative   8133
## 7       Self   9884
## 8       <NA> 169190
## 
## $TriageClass
##       x  freq
## 1    10  6081
## 2   101   216
## 3   102   140
## 4   103   303
## 5   104    14
## 6   105    17
## 7   106    95
## 8   107    18
## 9   108    30
## 10  109     1
## 11  110     3
## 12    6 78453
## 13    7 58017
## 14    8 41686
## 15    9  1477
## 16 <NA>  9175
## 
## $TriageSeverityID
##      x  freq
## 1    1  1610
## 2    2 60948
## 3    3 82894
## 4    4 43823
## 5    5  6332
## 6 <NA>   119
## 
## $PayerType
##            x  freq
## 1 Commercial 63027
## 2   Medicaid 40029
## 3   Medicare 53249
## 4      Other   522
## 5     Others    88
## 6   Self Pay 18542
## 7    Unknown 20269
## 
## $FamilyDoc
##          x   freq
## 1    10199     82
## 2    10200     81
## 3    10201     12
## 4    10204     32
## 5    10224      3
## 6    10372      9
## 7    10373      2
## 8    10375      2
## 9    10377      1
## 10   10397      1
## 11   10478    133
## 12   10479    137
## 13   10482      1
## 14   10483      3
## 15   10484      8
## 16   10485      1
## 17   10489     25
## 18   10490      1
## 19   10492     12
## 20   10495      5
## 21   10540     16
## 22   10541    305
## 23   10545     10
## 24   10548      4
## 25   10549      4
## 26   10550      2
## 27   10557      1
## 28   10560      1
## 29   10658      1
## 30   10659    351
## 31   10660      6
## 32   10662      4
## 33   10664      1
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## 35   10668     69
## 36   10669      3
## 37   10672      1
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## 2972     90262     1
## 2973     90266     1
## 2974     90293     1
## 2975     90501     1
## 2976     90631     1
## 2977     90732     1
## 2978     91104     1
## 2979     91106     1
## 2980     91214     1
## 2981     91401     2
## 2982     91604     1
## 2983     91730     1
## 2984     91759     1
## 2985     91786     1
## 2986     92039     1
## 2987     92067     2
## 2988     92069     1
## 2989     92109     2
## 2990     92115     9
## 2991     92354     1
## 2992     92376     1
## 2993     92377     1
## 2994     92508     1
## 2995     92536     1
## 2996     92571     1
## 2997     92586     1
## 2998     92603     1
## 2999     92610     2
## 3000     92662     1
## 3001     92663     1
## 3002     92683     1
## 3003     92688     3
## 3004     92821     1
## 3005     92886     1
## 3006     93065     1
## 3007     93111     1
## 3008     93212     1
## 3009     93215     1
## 3010     93230     2
## 3011     93308     1
## 3012     93703     1
## 3013     93940     1
## 3014     93950     1
## 3015     94015     1
## 3016     94019     1
## 3017     94115     1
## 3018     94401     2
## 3019     94513     1
## 3020     94539     2
## 3021     94541     1
## 3022     94549     2
## 3023     94550     1
## 3024     94565     2
## 3025     94610     3
## 3026     94705     1
## 3027     94952     1
## 3028     95009     1
## 3029     95046     1
## 3030     95076     2
## 3031     95121     1
## 3032     95125     1
## 3033     95126     1
## 3034     95134     2
## 3035     95204     2
## 3036     95330     2
## 3037     95648     1
## 3038     95747     1
## 3039     95821     1
## 3040     96150     1
## 3041     96377     1
## 3042     96761     1
## 3043     96826     1
## 3044     97023     1
## 3045     97124     1
## 3046     97206     1
## 3047     97239     1
## 3048     97401     1
## 3049     97459     2
## 3050     98001     1
## 3051     98007     1
## 3052     98053     1
## 3053     98102     1
## 3054     98104     3
## 3055     98144     1
## 3056     98258     1
## 3057     98516     1
## 3058     99504     1
## 3059     99506     1
## 3060     A1160     1
## 3061      FL05     1
## 3062    J1D2J5     1
## 3063    J1E0E3     2
## 3064    L4G6P7     1
## 3065    L4M4N6     1
## 3066    M1L0E1     1
## 3067    M6J1B1     1
## 3068    N4W2R4     1
## 3069   OX2 6PE     1
## 3070    RH76JD     3
## 3071  RM16 2DA     1
## 3072   SE182QT     1
## 3073   SN251RH     1
## 3074    SN31HW     1
## 3075    SW64AJ     1
## 3076       UNK     2
## 3077      <NA>   142
## 
## $AgeInYears
##       x freq
## 1     0 1385
## 2     1 1276
## 3     2  954
## 4     3  754
## 5     4  705
## 6     5  718
## 7     6  687
## 8     7  620
## 9     8  583
## 10    9  613
## 11   10  627
## 12   11  602
## 13   12  648
## 14   13  740
## 15   14  842
## 16   15 1007
## 17   16 1111
## 18   17 1436
## 19   18 2481
## 20   19 2683
## 21   20 2834
## 22   21 3372
## 23   22 3242
## 24   23 3305
## 25   24 3436
## 26   25 3481
## 27   26 3550
## 28   27 3525
## 29   28 3484
## 30   29 3207
## 31   30 3319
## 32   31 3194
## 33   32 3260
## 34   33 2993
## 35   34 3178
## 36   35 3060
## 37   36 3004
## 38   37 2851
## 39   38 2791
## 40   39 2616
## 41   40 2576
## 42   41 2516
## 43   42 2342
## 44   43 2288
## 45   44 2694
## 46   45 2969
## 47   46 2911
## 48   47 2746
## 49   48 2828
## 50   49 2894
## 51   50 2897
## 52   51 3199
## 53   52 3470
## 54   53 3328
## 55   54 3490
## 56   55 3403
## 57   56 3086
## 58   57 2926
## 59   58 2983
## 60   59 2672
## 61   60 2699
## 62   61 2452
## 63   62 2444
## 64   63 2505
## 65   64 2078
## 66   65 1997
## 67   66 2067
## 68   67 2123
## 69   68 2010
## 70   69 2178
## 71   70 1638
## 72   71 1705
## 73   72 1724
## 74   73 1801
## 75   74 1659
## 76   75 1593
## 77   76 1445
## 78   77 1480
## 79   78 1405
## 80   79 1368
## 81   80 1283
## 82   81 1303
## 83   82 1180
## 84   83 1235
## 85   84 1273
## 86   85 1220
## 87   86 1144
## 88   87  986
## 89   88  861
## 90   89  845
## 91   90  642
## 92   91  669
## 93   92  533
## 94   93  462
## 95   94  365
## 96   95  251
## 97   96  188
## 98   97  133
## 99   98   89
## 100  99   48
## 101 100   46
## 102 101   39
## 103 102   11
## 104 103    8
## 105 104    7
## 106 105  138
## 107 107    1
## 108 109    1
## 109 112    1
## 110 116    1
## 
## $GenderID
##   x   freq
## 1 0    609
## 2 1  87580
## 3 2 107537
## 
## $EthnicCode
##     x   freq
## 1 DEC    421
## 2  HL  12689
## 3 NHL 166226
## 4  UN  16390
## 
## $RaceCode
##    x   freq
## 1 AI    433
## 2 AS   2584
## 3 BL  74621
## 4 DE    218
## 5 OT   7912
## 6 PI     94
## 7  U   4122
## 8 UN    770
## 9 WH 104972
## 
## $PrimaryLanguageCode
##     x   freq
## 1  AR    218
## 2  BE     37
## 3  BP     19
## 4  CN     11
## 5  EL     22
## 6  EN 182580
## 7  ES   4264
## 8  FR     96
## 9  GU     45
## 10 HC     21
## 11 HI     66
## 12 IT     52
## 13 KO     86
## 14 MA    104
## 15 OT    202
## 16 PL     23
## 17 PU     37
## 18 RU     50
## 19 SL    110
## 20 SW     10
## 21 TL     16
## 22 TU     62
## 23 UN   7515
## 24 UR     23
## 25 VI     57
## 
## $MaritalStatus
##   x   freq
## 1 D  15105
## 2 M  58213
## 3 P    177
## 4 S 100418
## 5 U   2953
## 6 W  15670
## 7 X   3190
## 
## $ReligionCode
##       x  freq
## 1   AMI    17
## 2   BAP 18383
## 3   BUD   137
## 4   CAT 31915
## 5   CHR 11885
## 6   CSC   583
## 7   DEC 15893
## 8   EPI  2058
## 9   FRI    30
## 10  GRE   243
## 11  HIN   310
## 12  JEH  1306
## 13  JEW  1039
## 14  LUT  1456
## 15  MEN     8
## 16  MET 11362
## 17  MOR   330
## 18  MUS  2454
## 19  NON 39984
## 20  OTH  7881
## 21  PRE  2601
## 22  PRO  7866
## 23  RUS    26
## 24  SDA   359
## 25  UKR   132
## 26  UNI   117
## 27  UNK 16781
## 28 <NA> 20570
## 
## $HasEmailAddress
##                                              x  freq
## 1                                            -     2
## 2                           " I DONT KNOW IT "     4
## 3                                            ?     1
## 4                                            1    15
## 5                                    213609036     1
## 6                                   3025978382     2
## 7                                  BESTMOR_FAR     1
## 8                                         BIBE     2
## 9                  CANT REMENBER EMAIL ADDRESS     2
## 10                                    CECLINED     2
## 11                                        CELL     1
## 12                                       CHILD    23
## 13                                CODYBUCHANAN     1
## 14                                     DCELINE     1
## 15                                    DCELINED     7
## 16                                     DCLINED     3
## 17                                   DE3CLINED     1
## 18                                         DEC    26
## 19                                    DEC LINE     2
## 20                                   DEC LINED     2
## 21                                     DEC;NED     1
## 22                                     DEC;OME     1
## 23                                   DECELINED     1
## 24                                   DECFLINED     1
## 25                                      DECINE     1
## 26                                     DECINED     3
## 27                                    DECKINED     2
## 28                                        DECL     6
## 29                                   DECL INED     1
## 30                                   DECL;INED     1
## 31                                     DECLEIN     1
## 32                                    DECLI NE     1
## 33                                    DECLIEND     3
## 34                                   DECLIINED     4
## 35                                   DECLILNED     1
## 36                                    DECLIMED     1
## 37                                   DECLIN ED     1
## 38                                   DECLINCED     2
## 39                                     DECLIND     1
## 40                                   DECLINDED     1
## 41                                     DECLINE  5754
## 42                              DECLINE - NONE     2
## 43                              DECLINE   NONE     4
## 44                               DECLINE  NONE     3
## 45                    DECLINE (CAN'T REMEMBER)    12
## 46                   DECLINE AT THIS TIME 2125     1
## 47                                 DECLINE N O     1
## 48                              DECLINE PER PT     1
## 49                            DECLINE PER WIFE     1
## 50                             DECLINE TO GIVE     1
## 51                                DECLINE/NONE     1
## 52                                    DECLINEC     1
## 53                                    DECLINED 23040
## 54                       DECLINED AT THIS TIME     1
## 55            DECLINED AT THIS TIME 12/18 1752     3
## 56                              DECLINED EMAIL     2
## 57                       DECLINED OUT OF STATE     1
## 58                            DECLINED PER MOM     1
## 59                             DECLINED PER PT     1
## 60                            DECLINED TO GIVE     1
## 61                             DECLINED/  NONE     2
## 62                                   DECLINED`     1
## 63                                   DECLINEDN     1
## 64                                    DECLINES    39
## 65                                   DECLINEWD     1
## 66                                   DECLINIED     3
## 67                                   DECLLINED    13
## 68                                      DECLNE     1
## 69                                     DECLNED     6
## 70                                    DECLNIED     1
## 71                                    DEECLINE     1
## 72                                   DEFCLINED     1
## 73                                     DELCINE     5
## 74                                    DELCINED    56
## 75                                   DELCLINED     2
## 76                                      DELINE     3
## 77                                     DELINED     7
## 78                                      DENIED    45
## 79                                      DENIES     1
## 80                                   DFECLINED     1
## 81                                        DFES     8
## 82                                       DNIED     1
## 83                                        DONE     6
## 84                                  EDIGGY6691     1
## 85                         FAMILY STATES: NONE     1
## 86                                     GASGHHJ     1
## 87                                    HAS NONE     1
## 88                                         IML     1
## 89                               KELLIEJMORRIS     2
## 90                                       LNONE     2
## 91                                 MASBEAUPLAN     1
## 92                                MOM DECLINED     2
## 93                             MOTHER DECLINED     1
## 94                                           N     1
## 95                                         N/A    92
## 96                                        N0NE     1
## 97                                          NA    15
## 98                                        NADA     1
## 99                                       NIONE     6
## 100                                       NNOE     1
## 101                                         NO   346
## 102                                NO  DECLINE     1
## 103                                      NO DX     1
## 104                                  NO E-MAIL     5
## 105                                   NO EMAIL    92
## 106                           NO EMAIL ADDRESS     1
## 107                             NO EMAIL GIVEN     1
## 108                            NO EMAIL PER PT    10
## 109                                  NO REASON     1
## 110                                        NOE     3
## 111                                    NOEMAIL     2
## 112                                 NOEN GIVEN     1
## 113                                      NOINE     2
## 114                                       NOME     4
## 115                                        NON    15
## 116                                      NON E     2
## 117                                  NON GIVEN     1
## 118                                 NON PER PT     1
## 119                                       NONE 68647
## 120                                      NONE-     2
## 121                               NONE- PER PT     8
## 122                            NONE - DECLINED     1
## 123                           NONE  /  DECLINE     3
## 124                                NONE 5/6/69     1
## 125                               NONE 5881982     4
## 126                             NONE AVAILABLE     1
## 127                                  NONE GIVE     1
## 128                                 NONE GIVEN   340
## 129                         NONE GIVEN (CHILD)     1
## 130                   NONE GIVEN (MINOR CHILD)     1
## 131                                  NONE NONE     1
## 132                            NONE PER FATHER     1
## 133                          NONE PER GUARDIAN     3
## 134                 NONE PER HORIZON HOUSE REP     1
## 135                            NONE PER MOTHER     7
## 136                      NONE PER MOTHER OF PT     3
## 137                            NONE PER PARENT    11
## 138                           NONE PER PATIENT   203
## 139              NONE PER PATIENT AT THIS TIME     1
## 140                   NONE PER PATIENTS FAMILY     1
## 141                   NONE PER PATIENTS FATHER     2
## 142                   NONE PER PATIENTS MOTHER     6
## 143                   NONE PER PATIENTS PARENT     1
## 144                                NONE PER PT   547
## 145                          NONE PER PT CHILD     1
## 146                    NONE PER PT GRANDMOTHER     2
## 147                       NONE PER PT GUARDIAN     7
## 148                         NONE PER PT MOTHER     4
## 149                    NONE PER PT STEP MOTHER     1
## 150                        NONE PER PTS MOTHER     2
## 151                        NONE PER PTS PARENT     2
## 152                           NONE PER PTS POA     1
## 153                           NONE PER PTS SON     1
## 154                           NONE PT IS CHILD     1
## 155                             NONE; DECLINED     1
## 156                                      NONEE     1
## 157                                      NONFE     1
## 158                                      NONME     1
## 159                                      NONOE     1
## 160                                       NONW     1
## 161                              NOT AVAILABLE    11
## 162                               NOT AVAILBLE     1
## 163                                  NOT GIVEN     2
## 164                               NOT REQUIRED     1
## 165                                          O     1
## 166                           PATIENT DECLINED     4
## 167                         PATIENT IS A CHILD     4
## 168                        PATIENT STATES NONE     4
## 169                PATIENTS MOTHER STATES NONE     1
## 170                               PER DECLINED     1
## 171                                   PER NONE     3
## 172                             PER PR DECLINE     3
## 173                           PER PT  DECLINED     1
## 174                             PER PT DECLINE    62
## 175                            PER PT DECLINED    37
## 176                      PER PT DECLINED EMAIL     2
## 177                             PER PT DELCINE     2
## 178                            PER PT NO EMAIL     4
## 179                                PER PT NONE   238
## 180                                PREFERS NOT     1
## 181                  PT'S DAUGHTER STATES NONE     3
## 182                   PT'S FAMILY STATES: NONE     1
## 183                 PT'S GRANDMOM STATES: NONE     1
## 184                       PT'S MOM STATES NONE     5
## 185                      PT'S MOM STATES: NONE     7
## 186                        PT CAN NOT REMEMBER     1
## 187                           PT CANNOT RECALL     3
## 188                                 PT DECLINE     2
## 189                                PT DECLINED     7
## 190                                PT DECLINES     6
## 191          PT DOES NOT HAVE AN EMAIL ADDRESS     1
## 192                                 PT REFUSED     1
## 193                             PT STATED NONE     1
## 194                         PT STATES NO EMAIL     4
## 195                 PT STATES NO EMAIL ADDRESS     2
## 196                             PT STATES NONE    64
## 197                           PT STATES:  NONE     1
## 198                             PT STATES: NON     1
## 199                            PT STATES: NONE   149
## 200                        PT UNABLE TO ANSWER     2
## 201 PT WAS A TRAUMA DID NOT GET EMAIL ADDRESS;     3
## 202                                  PT: CHILD     1
## 203                                     REFUSE    12
## 204                                    REFUSED   247
## 205                             REFUSED PER PT     3
## 206                         REFUSED TO PROVIDE     1
## 207                                    RETIRED     1
## 208                                    RUFUSED     1
## 209                                RUNVUS41773     1
## 210                                 SCORRMAMM1     2
## 211                      THERE WAS NONE LISTED     2
## 212              THERE WAS NOTHING LISTED HERE     1
## 213                                 UAVAILABLE     7
## 214                                        UKN     6
## 215                                     UKNOWN     1
## 216                                UNABAILABLE     1
## 217                                UNAVAIALBLE     1
## 218                                  UNAVAIBLE     1
## 219                               UNAVAIILABLE     1
## 220                                    UNAVAIL     1
## 221                                 UNAVAILABE     1
## 222                                UNAVAILABLE   396
## 223                                 UNAVAILBLE    10
## 224                                 UNAVILABLE     2
## 225                                 UNEMPLOYED     3
## 226                                       UNIK     1
## 227                                    UNINOWN     1
## 228                                        UNK   108
## 229                                   UNKJNOWN     1
## 230                                       UNKN    15
## 231                                   UNKNIOWN     3
## 232                                    UNKNONW     1
## 233                                    UNKNOWM     1
## 234                                    UNKNOWN   824
## 235                           UNKNOWN  DECLINE     3
## 236                       UNKNOWN AT THIS TIME     1
## 237                             UNKNOWN PER PT     1
## 238                                    UNKNWON     5
## 239                                     UNKOWN     1
## 240                                          X     2
## 241                                        YES 70744
## 242                                       <NA> 23048

Datetime variables have the following characteristics:

##  EarliestDateTime              ArrivalSigninDateTime        
##  Min.   :2016-01-01 00:07:00   Min.   :2016-01-01 00:07:00  
##  1st Qu.:2016-03-31 19:23:15   1st Qu.:2016-03-31 21:31:15  
##  Median :2016-06-30 18:54:00   Median :2016-06-30 19:58:30  
##  Mean   :2016-07-01 12:44:13   Mean   :2016-07-01 13:53:05  
##  3rd Qu.:2016-09-29 19:40:45   3rd Qu.:2016-09-29 20:19:00  
##  Max.   :2016-12-31 23:52:00   Max.   :2016-12-31 23:52:00  
##                                NA's   :64                   
##  FullyRegisteredDateTime       EnteredEDDateTime            
##  Min.   :2016-01-01 00:37:00   Min.   :2016-01-01 00:11:37  
##  1st Qu.:2016-03-31 13:29:30   1st Qu.:2016-04-01 09:57:44  
##  Median :2016-06-29 21:03:00   Median :2016-06-30 04:40:56  
##  Mean   :2016-06-30 19:45:04   Mean   :2016-07-01 08:41:35  
##  3rd Qu.:2016-09-28 14:04:00   3rd Qu.:2016-09-29 13:45:10  
##  Max.   :2017-01-01 07:48:00   Max.   :2017-01-01 05:55:12  
##  NA's   :999                   NA's   :14217                
##  DoctorSawDateTime             NurseSawDateTime             
##  Min.   :2016-01-01 00:33:17   Min.   :2016-01-01 00:25:36  
##  1st Qu.:2016-04-01 21:33:42   1st Qu.:2016-04-01 00:48:11  
##  Median :2016-07-01 05:00:10   Median :2016-06-30 02:01:02  
##  Mean   :2016-07-01 22:32:47   Mean   :2016-07-01 00:38:10  
##  3rd Qu.:2016-09-30 10:48:09   3rd Qu.:2016-09-28 16:31:01  
##  Max.   :2017-01-01 05:51:09   Max.   :2017-01-01 06:34:45  
##  NA's   :10977                 NA's   :42265                
##  LeftEDDateTime               
##  Min.   :2016-01-01 01:18:48  
##  1st Qu.:2016-04-01 00:37:18  
##  Median :2016-06-30 23:03:59  
##  Mean   :2016-07-01 18:08:13  
##  3rd Qu.:2016-09-30 00:34:15  
##  Max.   :2017-01-03 07:28:00  
##  NA's   :14

There are nearly 196 thousand observations. About 8,700 have a positive value for the target variable, meaning about 4% of the ED visits ended with the patient leaving without treatment. There are no missing target variable values.

An examination of the timestamp values shows all of the observations are within the expected data range, January 1 through December 31, 2016.

There are numerous instances of missing time values throughout the dataset. One possible reason for being missing is that an event did not occur. Or, the event may have occurred, but the the time was never recorded. Either way, it does not seem reasonable to try to impute a missing time value, so they will be left blank.

Other variables also have missing values. For the most part these will be left as “Unknown” and no attempt will be made to impute. If there are enough missing values for a variable it will be excluded from the modeling process. Hopefully the size of the dataset will make imputting unneccessary.

For the variable AgeInYears, there are some instances where age equals 0. These could be patients under the age of 1. I’ll assume that is the case. There appear to be a disporportionate number (138) of patients who were 105 years old. It could be some kind of data entry error but I will include them as is.

Zip Codes are a mixture of 5 and 9 digit codes. The 9 digit codes will be truncated to the first 5 digits. There a couple of dozen Zip Codes containing letters (eg., J1D2J5). These will be converted to “Unknown”. Zip Codes that are blank, all zeros or all 9’s will also be converted to “Unknown”. Many of the non-Delaware Zip Codes have only one 1 or 2 cases. In my preprocessing I will consolidate these into a single “Out of State” factor.

ArrivedVia1 is missing about 900 values. These will be converted to “Unknown”.

ArrivedVia2 is predominantely empty, missing over 169 thousand values. The variable will be excluded from further analysis.

TriageClass is missing about 9 thousand values. These will be converted to “Unknown”.

TriageSeverity is missing 119 values. These will be converted to “Unknown”.

PayorType is missing about 20 thousand values. They are already coded as “Unknown”. These will be changed to “Self Pay”.

FamilyDoc is missing about 106 thousand values. These will be converted to “Unknown”.

HasEmailAddress has about 77 thousand “Yes” values. There are about 23 thousand missing values which will be converted to “Unknown”. The remainder of the values are various ways of saying “declined” or “none”. These will all be converted to “No”.

There is a variable called ProcDesc that is a brief free text description of why the patient came to the ED. It contains a mixture of plain English, abbreviations, ICD diagnosis codes and other forms of medical shorthand and is full of misspellings. For this field I will attempt to create a binary classification or probability variable that can be added to the model.

Pre-Processing

## Zip Code
sourcedata$Zip <- substring(sourcedata$Zip, 1, 5)

Feature Engineering

Modeling

Assessment of the Model

References:
(1) http://www.medscape.com/viewarticle/702797
(2) http://www.cepamerica.com/news-resources/perspectives-on-the-acute-care-continuum/2015-december/evidence-based-practice
(3) https://www.ncbi.nlm.nih.gov/pubmed/24080998