IRT

1、研究者使用某一20题组成的测验对25名学生进行测试,每名被试在每道题的得分情况如下,0为答错,1为答对。试对该测验各项目进行分析。

ID

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

1

1

1

1

1

1

1

0

1

0

1

1

1

1

1

1

1

1

1

1

1

2

0

1

1

1

1

1

0

0

1

1

1

1

1

1

1

1

1

1

1

1

3

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

4

1

1

1

0

1

1

1

0

0

1

1

1

1

1

1

0

1

1

1

1

5

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

6

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

7

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

8

1

1

0

1

1

1

0

0

1

1

1

1

1

1

1

0

1

1

1

1

9

0

1

1

0

1

1

1

0

0

0

1

1

1

1

1

0

1

1

1

1

10

0

0

1

1

1

0

1

0

0

1

1

1

1

1

1

1

1

1

1

1

11

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

12

0

1

1

1

1

1

1

1

0

1

1

0

1

1

1

1

1

1

1

1

13

1

1

1

1

0

1

0

0

1

1

1

1

1

1

1

0

1

1

1

1

14

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

15

0

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

16

0

1

1

1

1

1

1

0

0

1

1

1

1

1

1

1

1

1

1

1

17

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

18

1

0

1

1

1

1

0

0

1

1

1

1

1

1

1

1

1

1

1

1

19

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

20

1

1

0

0

0

0

1

0

1

1

1

1

1

1

1

1

1

1

1

1

21

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

22

1

1

0

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

23

1

1

1

1

1

1

1

0

0

1

1

1

1

1

1

1

1

1

1

1

24

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

25

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1