Analysis | Item residual | Person residual | Chi-square interaction | Psi | T test n (%, CI) |
---|
Mean | SD | Mean | SD | Value | DF | P |
---|
Original version | 0.355 | 2.413 | −0.296 | 1.464 | 371.1 | 160 | < 0.001 | 0.84 | 15 (3.35%, 1.8–4.8%) |
Thresholds ordered | −0.052 | 1.880 | −0.347 | 1.416 | 330.5 | 160 | < 0.001 | 0.85 | 16 (3.57%, 2–5.1%) |
Items 13, 18 deleted | 0.322 | 1.561 | −0.383 | 1.521 | 180.3 | 144 | 0.022 | 0.85 | 16 (3.80%, 2.2–5.4%) |
- Values highlighted in bold in the probability column indicate statistical significance at the 0.05 level after Bonferroni adjustment for the original version, with thresholds ordered set at 0.0025 for 20 items and with two items deleted set at 0.0027 for 18 items
- Independent t tests were performed with eight items divided into two subsets representing most diversity along a continuum. Each subset included > 15 thresholds for the original version and > 12 thresholds for the version with thresholds ordered and with two items deleted
- DF degrees of freedom
- P probability value
- Psi Person separation index reported with extrapolated person values included
- CI confidence interval reported as lowest to highest