Construct Validity of the Holistic Complementary and Alternative Medicines Questionnaire (HCAMQ)—An Investigation Using Modern Psychometric Approaches
Table 5
Complementary and Alternative Medicine beliefs subscale Rasch analysis results.
Analysis number
Item fit residual
Person fit residual
interaction
PSI
Unidimensionality independent -test (%) (95% CI)
Mean
S.D.
Mean
S.D.
Value (df)
1
0.278
2.097
−0.370
1.227
62.78 (12)
<.001
0.68
7.24 (4.4 to 10.1)
2
−0.331
1.818
−0.554
1.361
57.48 (12)
<.001
0.65
12.22 (9.3 to 15.1)
3
−0.425
1.967
−0.487
1.181
40.86 (12)
<.001
0.64
7.24 (4.4 to 10.1)
4
−0.228
2.112
−0.430
1.145
52.82 (12)
<.001
0.69
7.24 (4.4 to 10.1)
−0.289
1.408
−0.498
1.018
6.90 (8)
.55
0.73
3.21 (0.3 to 6.1)
0.465
0.824
−0.615
1.552
17.33 (8)
.03
0.77
4.59 (1.7 to 7.5)
0.232
1.789
−0.445
0.797
8.89 (4)
.06
0.51
1.38 (−1.5 to 4.3)
analysis 3, questions 8 and 11 have been deleted, thus a 4-item subscale remains; 6 gives the results for the 4-item CAM scale (questions 2, 4, 6 and 9); 7 gives the results for the 2-item CAM scale (questions 8 and 11).
