Test length and validity
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Abstract
The effect of test length on predictive validity is
examined empirically by successively omitting the
poorest items and by calculating the correlations
between the reduced test scores and the criterion. It
was found, for four tests, that the curve of validity
against test length had a very gentle slope for the
longer tests and that all tests could be reduced by
more than 60% without appreciable decreases in
validity.
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Bell, Richard & Lumsden, James. (1980). Test length and validity. Applied Psychological Measurement, 4, 165-170. doi:10.1177/014662168000400203
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doi:10.1177/014662168000400203
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Bell, Richard C.; Lumsden, James. (1980). Test length and validity. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/100028.
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