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Educational and Psychological Measurement
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Coefficients of Effective Length

Roger H. Edwards

St. Louis Public Schools

Coefficients of Effective Length (CEL's) derived from the Spear-man-Brown formula can be an effective tool in assessing the net worth of an altered measurement procedure. Under certain conditions, however, a validity CEL can produce highly misleading results. A modified coefficient is suggested for use when empirical studies indicate that underlying assumptions have been violated.

Educational and Psychological Measurement, Vol. 41, No. 2, 283-285 (1981)
DOI: 10.1177/001316448104100205
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