The effect of test length on predictive validity is examined empirically. For four tests, the curve of validity against test length had a very gentle slope for the longer tests and all tests could be reduced by more than 60 percent without appreciable decreases in validity. (Author/BW)

Two local methods for observed-score equating are applied to the problem of equating an adaptive test to a linear test. In an empirical study, the methods were evaluated against a method based on the test characteristic function (TCF) of the linear test and traditional equipercentile equating applied to the ability estimates on the adaptive test…

The usefulness of three item response theory-based methods and the Mantel Haenszel technique in evaluating the measurement equivalence of translated assessment instruments was demonstrated in a study involving 2,000 French-speaking Canadian adults who took a French test translation and 2,000 English-speaking adults who took the English original.…