DiSimoni F G, Keith R L, Holt D L, Darley F L
J Speech Hear Res. 1975 Sep;18(3):491-7. doi: 10.1044/jshr.1803.491.
This study investigated the practicality of developing short forms of the Porch Index of Communicative Ability (PICA). Stepwise regression procedures were performed using data from 222 complete administrations of the PICA to determine the accuracy of prediction of overall scores on the basis of data from either fewer subtests or fewer items. Results indicated that the PICA is highly redundant and that it may be possible to develop useful shorter forms of it.
