Factor and discriminant analysis of the Bem Sex-Role Inventory

Several studies have recently recommended that items which fail to load substantially (< .40) on one of several primary factors characterizing the Bem Sex-Rote Inventory (BSRI) could be deleted without substantial loss of interpretability. This recommendation is questioned on the basis that the extent of interrelatedness of the items is an insufficient indicator of the contribution each item makes towards the classification (identifying sex-types by Bem's median split technique) efficiency of the inventory. Empirical support of this contention was provided by conducting several discriminant analyses (predicting sex-types) on a sample of 1117 BSRI protocols and excluding the various items suggested by the earlier research. These results were then compared with the results of a discriminant analysis using the 40 masculine and feminine items. The analyses using less. than all 40 items produced substantially poorer discrimination than when all 40 items were included. The results Suggest that decisions to exclude items on the basis of factor analysis may be inappropriate and risk serious loss of power in classifying individuals by sex-type.