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Table 3 Correlation coefficients, reliabilities, variances, and covariances for the eight domains

From: Application of a multidimensional computerized adaptive test for a Clinical Dementia Rating Scale through computer-aided techniques

Domain A B C D E F G H
A   0.55 0.55 0.11 0.28 0.29 0.1 0.27
B 0.91   0.64 0.13 0.31 0.32 0.11 0.31
C 0.92 0.94   0.12 0.29 0.29 0.1 0.32
D 0.88 0.92 0.83   0.06 0.07 0.02 0.06
E 0.95 0.93 0.89 0.89   0.16 0.06 0.16
F 0.93 0.91 0.84 0.89 0.96   0.06 0.17
G 0.82 0.8 0.72 0.79 0.86 0.86   0.06
H 0.8 0.79 0.84 0.74 0.86 0.85 0.79  
Variance 0.53 0.69 0.67 0.03 0.16 0.18 0.03 0.22
Reliabilitya 0.78 0.75 0.73 0.68 0.78 0.75 0.69 0.63
Item length 14 6 3 5 5 5 9 6
Reliabilityb 0.72 0.5 0.41 0.43 0.43 0.43 0.69 0.5
Mean in logit − 0.92 − 0.69 − 0.01 − 0.86 − 0.61 − 0.71 − 0.97 − 0.44
SD 0.02 0.03 0.03 0.01 0.01 0.01 0.01 0.02
  1. Correlation coefficient: lower left; covariance: upper right; aMCAT reliabilities; bCAT reliabilities (i.e., Cronbach’s α values)