After running Exploratory Factor Analysis in spss v.17 I deleted 4 measurement items which yielded low factor loadings. Now I want to proceed to Confirmatory Factor Analysis to calculate AVE and CR. My Question is should I repeat the EFA to obtain the new factor loadings after deletion of those 4 variables(items) and conduct the CFA based on them or i should do it with the original factor loadings? Thnx 4 your help.
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In my view, exploratory factor analysis is mainly use to identify the number of dimensions and describe a simple structure of interrelated measures. In addition, it is used to verify items cross-loadings (items loading on two or more factors), or unreliable indicators (low communality or a very low unique factor-specific loading, <.3 means less than 9% of explained variance). As the name suggests, it is exploratory in nature; you can repeat it with different subset of variables, or with some items singled out, to isolate a reliable factor structure. Based on a pre-defined pattern matrix of item/factor loadings, a confirmatory factor model is mainly used to test hypotheses about your underlying construct (which also means you have to check assumptions for associated tests). This would obviously be a biased approach to test your factor structure on the same sample of individuals, and you will get over-optimistic measures of goodness of fit or Average Variance Extracted. In case you have a large sample, you can use some kind of internal cross-validation (e.g., split your sample using 50:50 and test factor structure on the holdout sample), but that does not guarantee the generalizability of your results beyond the sample at hand. |
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