| Abstract: | The purpose of this study was to determine in what way Guttman weighting affected the internal consistency and intercorrelation of the suhtests of the Scholastic Aptitude Test. The tests were first scored with Guttman weights and then with conventional correction-for-guessing weights. The internal consistency of the tests increased markedly when Guttman weights were used. The correlation of the two verbal subtests increased somewhat when Guttman weights were used, but the correlation of the two mathematics subtests as well as the intercorrelation of all verbal and mathematics subtests decreased. Differences in the factor structure of the Guttman- and conventionally-weighted subtests were used to explain the result. |
