When I add up the scores for the three subtests and average them, it does not equal the Total Reading score. How are the scores on the SDRT calculated?
The Total Reading score is not an average of the three scores on the subtests–weighted, unweighted, or otherwise. It is based on the total number of questions answered correctly on all portions of the test and is derived by comparing how the student performed on the whole test with how students from different grade levels at different times of the year have typically performed on the same test.
