Teachers' Ability To Estimate Item Difficulty: A Test of the Assumptions in the Angoff Standard Setting Method.

Sixth-grade teachers (n=26) estimated item performance for their students (724 total students) on a 50-item district-wide science test. Teachers were more accurate in estimating performance of the total group than of the borderline group, but in neither case was their accuracy high. Estimating proportion-correct values using the Angoff standard setting procedure may be questionable. (Author/MAK)