Measurement properties of subjective magnitude estimates of word frequency1

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Stevens' subjective magnitude estimation (SME) method was used in obtaining estimates of relative word frequency from two adult groups (15 lexicographers, 13 other adults) for 60 words ranging widely in objective frequency. Lexicographers rendered more reliable estimates, and their averaged data correlated more highly (.970) with objective log frequency than those of the second group (.923). The objective frequency of the first stimulus considered in the SME task is not related to an S's overall accuracy in predicting objective frequency. but accuracy is related to the S's tendency to perceive frequency ratios as relatively large. Subjective estimates measures something slightly different from what is indexed by currently available objective counts, and may be more valid measures of true word probability.

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1

This work was supported by the National Institute of Child Health and Human Development, under Research Grant 1 P01 HD01762. I thank Mr. Barry Richman, of the American Heritage Publishing Co., Inc., for securing the cooperation of both groups of subjects and for arranging for the collection of the data. I also thank Miss Barbara Witten for her assistance in the computations and data analysis.

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