## 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,] 1.982657 0.7509139 20
## [2,] 1.628579 0.7441675 20
## [3,] 1.628579 0.7441675 20
## [4,] 1.628579 0.7441675 20
## [5,] 1.628579 0.7441675 20
## [6,] 1.628579 0.7441675 20
Item Parameters
Sort Item Parameters according to Item Discrimination
## discrimination difficulty guessing
## A1 0.633 -4.265 0
## A2 0.633 -0.331 0
## A3 0.633 -2.891 0
## A4 0.633 -0.916 0
## A5 0.633 -3.705 0
## A6 0.633 -4.367 0
## A7 0.633 -2.985 0
## A8 0.633 -0.720 0
## A9 0.633 -2.236 0
## A10 0.633 1.332 0
## A11 0.633 4.411 0
## A12 0.633 -4.447 0
## A13 0.633 -3.987 0
## A14 0.633 -1.182 0
## A15 0.633 -1.759 0
## A16 0.633 2.929 0
## A17 0.633 1.139 0
## A18 0.633 4.669 0
## A19 0.633 -3.821 0
## A20 0.633 -3.201 0
Most difficult to easiest items
## discrimination difficulty guessing
## A18 0.633 4.669 0
## A11 0.633 4.411 0
## A16 0.633 2.929 0
## A10 0.633 1.332 0
## A17 0.633 1.139 0
## A2 0.633 -0.331 0
## A8 0.633 -0.720 0
## A4 0.633 -0.916 0
## A14 0.633 -1.182 0
## A15 0.633 -1.759 0
## A9 0.633 -2.236 0
## A3 0.633 -2.891 0
## A7 0.633 -2.985 0
## A20 0.633 -3.201 0
## A5 0.633 -3.705 0
## A19 0.633 -3.821 0
## A13 0.633 -3.987 0
## A1 0.633 -4.265 0
## A6 0.633 -4.367 0
## A12 0.633 -4.447 0
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 |
1.28 |
| 12 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 13 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 14 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
17 |
1.28 |
| 15 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
17 |
1.28 |
| 16 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
17 |
1.28 |
| 17 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 18 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
17 |
1.28 |
| 19 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
17 |
1.28 |
| 20 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
17 |
1.28 |
| 21 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 22 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 23 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 24 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
17 |
1.28 |
| 25 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
17 |
1.28 |
| 26 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 27 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
17 |
1.28 |
| 28 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 29 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
17 |
1.28 |
| 30 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
17 |
1.28 |
| 31 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 32 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
17 |
1.28 |
| 33 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 34 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 35 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 36 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 37 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
17 |
1.28 |
| 38 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
17 |
1.28 |
| 39 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 40 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 41 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.28 |
| 42 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
1 |
17 |
1.28 |
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 |
1.629 |
| 3 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
1.629 |
| 4 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
1.629 |
| 5 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
1.629 |
| 6 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
1.629 |
| 7 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
1.629 |
| 8 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
1.629 |
| 9 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
1.629 |
| 10 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
18 |
1.629 |