数据介绍：
数据供包含64道题目，其中，1-12是第一个维度，13-24是第二个维度，25-38是第三个维度，39-52是第四个维度，53-64是第五个维度
希望老师在Mplus中，跑2个IRT模型，并提供下表的信息和图形。（我可以自己整理表格）
1多维IRT模型，高阶模型，1个高阶因子，5个一阶因子。
2 单维IRT模型，所有的题目都视为一个维度。
√Table 1
IRT analysis of the Items of test （2PL）
Item
M
SD
IRT
a_G
a1
a2
a3
a4
a5
d
MDISC
MDIFF
Dimension1
1
2
3
4
5
6
7
8
11
12
Dimension 2
13
14
15
16
17
18
19
21
22
23
24
Dimension 3
26
28
29
30
31
33
34
35
36
37
38
Dimension 4
41
42
43
44
45
46
47
48
49
50
51
52
Dimension 5
53
57
59
60
61
63
64
Notes: D1= Item discrimination index; D2 = Point Biserial Correlation
(a) Item 11-acceptable discrimination
(b)Item-5 medium discrimination
(c)Item-47 excellent discrimination
√ Figure 1 MIRT item characteristic surface
√Table 2
Summary for the item difficulty of the test
Difficulty
n
Type
percentage
Item
0.00-0.10
0
5
difficult
0.00%
9.80%
–
0.11-0.20
1
1.96%
61
0.21-0.30
4
7.84%
57,59,60,64
0.31-0.40
6
40
medium
11.76%
78.43%
30,41,49,51,53,63
0.41-0.50
14
27.45%
2,4,5,7,11,15,19 ,28,42,43,44,45,48,52
0.51-0.60
13
25.49%
3,8,12,13, 21,29,31,36,37,38,46,47,50
0.61-0.70
7
13.73%
6,16,17,23,26,33,35
0.71-0.80
4
6
easy
7.84%
11.76%
1,22,24,34
0.81-0.90
2
3.92%
14,18
0.91-1.00
0
0.00%
–
√Table 3
Summary for the item discrimination of test
Discrimination
n
percentage
Item
0.40 and above
0.30-0.39
0.20-0.29
below 0.20
√Table 4
MIRT estimated ability of the sub-scales of in study 3.
Dimension
M
SD
General
1
2
3
4
5
Notes: According to IRT theory, abilities should follow a normal distribution with a mean value of zero and a variance value of one
Figure 2 The normal distribution of the subjects’ abilities
Figure 2 Hierarchical Five-factor model used in the confirmatory factor analysis
单维信息量