Equivalence of Free‐Response and Multiple‐Choice Items

This study examined the relationship of multiple‐choice and free‐response items contained on the College Board's Advanced Placement Computer Science (APCS) examination. Confirmatory factor analysis was used to test the fit of a two‐factor model where each item format marked its own factor. Results showed a single‐factor solution to provide the most parsimonious fit in each of two random‐half samples. This finding might be accounted for by several mechanisms, including overlap in the specific processes assessed by the multiple‐choice and free‐response items and the limited opportunity for skill differentiation afforded by the year‐long APCS course.