2003 IMTA Proceedings - International Military Testing Association

Table 2. Summary Goodness of Fit indices and χ2 tests of the 18-item Commitment Scale
Statistic Desired Fit Indices Obtained Fit
Indices
χ2 - 362.18 (132),
p=0.00
Root Mean Square Error of Approximation
(RMSEA)
Standardised Root Mean Square Residual
(RMR)
< 0.05 (Good)
0.05-0.08
(Reasonable)
0.066
< 0.05 (Acceptable) 0.065
Goodness of Fit Index (GFI) >0.90 (Acceptable) 0.91
Comparative Fit Index (CFI) >0.90 (Acceptable) 0.92
The above-mentioned indices were selected as recommended by Diamantopoulos and
Siguaw (2000) to make an informed decision. It is noted that the chi-sq value was significant
thus suggesting a poor fit. However, this was to be expected, as chi-sq is sensitive to samples
that exceed 200. Based on the other indices, it can be concluded that the data from the 18
items produced an acceptable fit to the model.
Exploratory Factor Structure of the 48-item Work Variables
To facilitate the meaningful interpretation of the work variables surveyed, an
exploratory factor analysis was conducted on the 48 items. The work items retained after the
EFA and Scaled Reliability Analysis were reduced from 48 to 45 items, which loaded onto 8
factors. These, together with the summary statistics obtained for each of these factors are
described in Table 3 below. Given their acceptable Cronbach Alpha coefficients, they were
subsequently used as the predictor variables for the 3 Commitment scales.
Table 3. 8-Factor Solution based on Exploratory Factor Analysis (Principal Axis Factor
Extraction,Varimax Rotation) of 48-item Work Variables following Scale Reliability
Analysis
745
45 th Annual Conference of the International Military Testing Association
Pensacola, Florida, 3-6 November 2003