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Educational and Psychological Measurement
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Trend Analysis the Easy Way

Jacob Cohen

New York University

When sample sizes and/or X intervals are unequal, the analysis of variance computations for trend analysis become quite complicated. This is because the usual simplicity of analysis of variance algorithms depend upon "regular" conditions for which sources of variance are orthogonal. This article shows how multiple regression/ correlation analysis, a more general procedure that allows for non-orthogonality, may be applied in order to accomplish with great simplicity trend analysis under "irregular" conditions.

Educational and Psychological Measurement, Vol. 40, No. 3, 565-568 (1980)
DOI: 10.1177/001316448004000301
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