The Psychometric Properties of the Original Version of Assessment of Time Management Skills (ATMS)

Table 3

Rasch analysis results on all 30 items together, the three subscales, and for tentative subscales with only fitting items.

	Item fit	PCA^a Eigenvalue in first contrast	Local independence largest interitem correlation	Item reliability	Person reliability	Number of strata	Mean person measure	Item DIF between male and female	Item DIF between different educational levels
ATMS 30 items	4 item misfit (no. 4, 10, 27, 28)	4.5	0.69	0.98	0.83	3	0.47
Time management subscale 11 items	1 item misfit (no. 10)	2.1	0.20	0.96	0.77	2	1.45	No	No
Time management subscale 10 items	No misfit	1.9	0.23	0.96	0.75	2	1.39	No	No
Organization & planning subscale 11 items	1 item misfit (no. 28)	1.9	0.23	0.98	0.70	2	0.32	No	No
Organization & planning subscale 10 items	No misfit	2.0	0.22	0.97	0.70	2	0.56	No	No
Regulation of emotions subscale 5 items	No misfit	1.6	0.01	0.98	0.38	1	0.02	No	No

^aPCA: principal component analysis of residuals. Tentative subscales with only fitting items included. These are not part of the final result.