Property | Criteria for acceptability | Performance of the CSIS | Performance of the TSIS |
Item analysis/ reduction | All items should have factor loadings > .30 | Factor loadings range .49 to .86 | Factor loadings range .77 to .90 |
Missing data < 5% | No missing data | No missing data | |
Inter-item correlations < .75 | Inter-item correlations range .47 to .72 | Inter-item correlations range .63 to .73 | |
Item total correlations ≥ .25 | Item total correlations range .50 to .83 | Item total correlations range .70 to .89 | |
Maximum endorsement frequency < 80% | Maximum endorsement frequency = 61% | Maximum endorsement frequency = 55% | |
Minimum adjacent endorsement > 10% | Minimum adjacent endorsement = 11.6% | Minimum adjacent endorsement = 17.4% | |
Acceptability | Skewness values < 1 | Maximum skewness .91 | Maximum skewness .83 |
Missing data < 5% | No missing data | No missing data | |
Reliability | Cronbach Alpha > .70 | Cronbach Alphas .88 | Cronbach Alpha .97 |
Item total correlations ≥ .20 | Item total correlations range .48 to .71 | Item total correlations range .65 to .90 |