## Loading required package: sm
## Package `sm', version 2.2-5: type help(sm) for summary information
## Loading required package: ltm
## Loading required package: MASS
##
## Attaching package: 'MASS'
## The following object is masked from 'package:sm':
##
## muscle
## Loading required package: msm
## Loading required package: polycor
## Loading required package: mvtnorm
## Loading required package: sfsmisc
Estimation
## est sem n
## [1,] 1.186119 0.5494026 20
## [2,] 2.324989 0.5415616 20
## [3,] 2.324989 0.5415616 20
## [4,] 2.324989 0.5415616 20
## [5,] 2.324989 0.5415616 20
## [6,] 2.324989 0.5415616 20
Item Parameters
Sort Item Parameters according to Item Discrimination
## discrimination difficulty guessing
## A18 20.246 1.892 0.038
## A10 2.670 1.498 0.235
## A12 2.194 -1.930 0.007
## A4 1.523 0.018 0.266
## A7 1.447 0.093 0.718
## A11 1.349 9.753 0.067
## A6 1.120 -2.757 0.002
## A15 1.093 -1.149 0.001
## A19 1.004 -2.623 0.000
## A1 0.990 -2.951 0.001
## A13 0.939 -2.874 0.002
## A3 0.836 -2.292 0.001
## A8 0.805 -0.587 0.001
## A9 0.741 -1.953 0.002
## A5 0.704 -3.367 0.006
## A14 0.663 -1.130 0.002
## A17 0.448 1.593 0.007
## A20 0.352 -5.466 0.004
## A2 0.010 66.186 0.318
## A16 -1.808 -8.468 0.152
Most difficult to easiest items
## discrimination difficulty guessing
## A2 0.010 66.186 0.318
## A11 1.349 9.753 0.067
## A18 20.246 1.892 0.038
## A17 0.448 1.593 0.007
## A10 2.670 1.498 0.235
## A7 1.447 0.093 0.718
## A4 1.523 0.018 0.266
## A8 0.805 -0.587 0.001
## A14 0.663 -1.130 0.002
## A15 1.093 -1.149 0.001
## A12 2.194 -1.930 0.007
## A9 0.741 -1.953 0.002
## A3 0.836 -2.292 0.001
## A19 1.004 -2.623 0.000
## A6 1.120 -2.757 0.002
## A13 0.939 -2.874 0.002
## A1 0.990 -2.951 0.001
## A5 0.704 -3.367 0.006
## A20 0.352 -5.466 0.004
## A16 -1.808 -8.468 0.152
Total item 1
There are several different patterns all with a score of 17
| 11 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.186 |
| 12 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.186 |
| 13 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
17 |
1.184 |
| 14 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
17 |
1.778 |
| 15 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
17 |
1.995 |
| 16 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
17 |
2.323 |
| 17 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.186 |
| 18 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
17 |
1.037 |
| 19 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
17 |
1.037 |
| 20 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
17 |
1.991 |
| 21 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.186 |
| 22 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.186 |
| 23 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.186 |
| 24 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
17 |
2.323 |
| 25 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
17 |
2.172 |
| 26 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
0.952 |
| 27 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
17 |
2.172 |
| 28 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
17 |
0.796 |
| 29 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
17 |
2.172 |
| 30 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
17 |
2.172 |
| 31 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.186 |
| 32 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
17 |
2.172 |
| 33 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
17 |
1.184 |
| 34 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.186 |
| 35 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.186 |
| 36 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.186 |
| 37 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
17 |
1.326 |
| 38 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
17 |
1.037 |
| 39 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.186 |
| 40 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
0.796 |
| 41 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.184 |
| 42 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.186 |
Total item 18
There is a single scoring pattern (all answered only item 2 incorrectly) for a grade of 18
| 2 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
2.325 |
| 3 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
2.325 |
| 4 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
2.325 |
| 5 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
2.325 |
| 6 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
2.325 |
| 7 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
2.325 |
| 8 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
2.325 |
| 9 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
2.325 |
| 10 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
2.325 |