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Direct linkBolt, Daniel M.; Liao, Xiangyi – Journal of Educational Measurement, 2021
We revisit the empirically observed positive correlation between DIF and difficulty studied by Freedle and commonly seen in tests of verbal proficiency when comparing populations of different mean latent proficiency levels. It is shown that a positive correlation between DIF and difficulty estimates is actually an expected result (absent any true…
Descriptors: Test Bias, Difficulty Level, Correlation, Verbal Tests
