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The Application of Sheppard's Correction for Grouping

Published online by Cambridge University Press:  01 January 2025

George A. Ferguson
George A. Ferguson*
Affiliation:
Department of Education, University of Edinburgh
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Abstract

This paper attempts to show in a non-mathematical way the influence of grouping on standard deviations and correlations, and advances empirical evidence to illustrate with what accuracy values corrected for grouping by Sheppard's correction approximate to values obtained from ungrouped data when the distributions are continuous. This enquiry gained its initial stimulus from the observation that many standard deviations and correlations reported by students of psychology and education are uncorrected for grouping and that frequently errors attributable to the grouping of data are not small when compared with errors of sampling.

Type
Original Paper
Information
Psychometrika , Volume 6 , Issue 1 , February 1941 , pp. 21 - 27
Copyright
Copyright © 1941 Psychometric Society

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