Coefficient alpha values for the EPOMS subscales ranged from .
Internal consistency coefficients for the EPOMS computed on the larger sample of 1760 participants are as follows: Tension, .
Based upon careful inspection of the internal consistency reliability coefficients, however, it appears that the EPOMS might benefit from a carefully planned revision.
Exploratory factor analysis: Using the previously described merged EPOMS data set (n = 1760), a principal components factor analysis of the 30 EPOMS items specifying six factors and employing promax rotation was conducted.
The principal components factor correlation matrix for the six EPOMS factors as well as the CFA inter-factor correlations are shown in Table 3.
Confirmatory Factor Analysis: A confirmatory factory analysis (CFA) employing SAS CALIS procedures was conducted using the EPOMS dataset (n=1760).
In an attempt to further affirm the EPOMS model shown in the above results, a similar confirmatory factor analysis utilizing the cross-validation sample of 470 participants was conducted on the EPOMS scales with the "Efficient" item deleted.
1990), Grove and Prapavessis (1992), and the EDITS 30-item EPOMS is provided.
A comparison of principal components analyses and confirmatory factor analyses of the POMS relative to the EPOMS suggests that the rationale for deletion of various POMS items, as seen in the development of the EPOMS, is corroborated.