CW2425

subject_name<-c("John Doe","Jane Doe","Steve Graves")
temperature<-c(98.1,98.6,101.4)
flu_status<-c(FALSE,FALSE,TRUE)
temperature[2]

## [1] 98.6

temperature[2:3]

## [1]  98.6 101.4

temperature[-2]

## [1]  98.1 101.4

gender<-factor(c("MALE","FEMALE","MALE"))
gender

## [1] MALE   FEMALE MALE  
## Levels: FEMALE MALE

blood<-factor(c("O","AB","A"),levels =c("A","B","AB","O"))
blood

## [1] O  AB A 
## Levels: A B AB O

symptoms<-factor(c("SEVERE","MILD","MODERATE"),levels=c("MILD","MODERATE","SEVERE"),ordered=TRUE)
symptoms

## [1] SEVERE   MILD     MODERATE
## Levels: MILD < MODERATE < SEVERE

symptoms>"MODERATE"

## [1]  TRUE FALSE FALSE

symptoms>="MODERATE"

## [1]  TRUE FALSE  TRUE

subject_name[1]

## [1] "John Doe"

temperature[1]

## [1] 98.1

flu_status[1]

## [1] FALSE

gender[1]

## [1] MALE
## Levels: FEMALE MALE

blood[1]

## [1] O
## Levels: A B AB O

symptoms[1]

## [1] SEVERE
## Levels: MILD < MODERATE < SEVERE

pt_data<-data.frame(subject_name,temperature,flu_status,gender,blood,symptoms,stringsAsFactors = FALSE)
pt_data

##   subject_name temperature flu_status gender blood symptoms
## 1     John Doe        98.1      FALSE   MALE     O   SEVERE
## 2     Jane Doe        98.6      FALSE FEMALE    AB     MILD
## 3 Steve Graves       101.4       TRUE   MALE     A MODERATE

pt_data$subject_name

## [1] "John Doe"     "Jane Doe"     "Steve Graves"

pt_data[2,]

##   subject_name temperature flu_status gender blood symptoms
## 2     Jane Doe        98.6      FALSE FEMALE    AB     MILD

pt_data[c(1,3),c(4,2)]

##   gender temperature
## 1   MALE        98.1
## 3   MALE       101.4

pt_data[c(1,3),c("temperature","gender")]

##   temperature gender
## 1        98.1   MALE
## 3       101.4   MALE

pt_data$temp_c<-(pt_data$temperature-32)*(5/9)
pt_data

##   subject_name temperature flu_status gender blood symptoms   temp_c
## 1     John Doe        98.1      FALSE   MALE     O   SEVERE 36.72222
## 2     Jane Doe        98.6      FALSE FEMALE    AB     MILD 37.00000
## 3 Steve Graves       101.4       TRUE   MALE     A MODERATE 38.55556

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