| Abstract: | This paper examines the intercorrelation matrix of the subtests of the Porch Index of Communication Ability using a variety of factor analytic and rotational procedures. In addition to a general factor reflecting overall language dysfunction, verbal, graphic, and gestural factors were also found which accounted for 83% of the total variance. These factors were related to Schuell's Howes', and Wepman's models of aphasia. The impact of factor analytic methodology on the conclusions drawn from the same data was also examined and suggestions for clinical use of this battery were discussed. |
