Study samples are too small to produce sufficiently precise reliability coefficients

The Journal of General Psychology
Richard A Charter

Abstract

In a survey of journal articles, test manuals, and test critique books, the author found that a mean sample size (N) of 260 participants had been used for reliability studies on 742 tests. The distribution was skewed because the median sample size for the total sample was only 90. The median sample sizes for the internal consistency, retest, and interjudge reliabilities were 182, 64, and 36, respectively. The author presented sample size statistics for the various internal consistency methods and types of tests. In general, the author found that the sample sizes that were used in the internal consistency studies were too small to produce sufficiently precise reliability coefficients, which in turn could cause imprecise estimates of examinee true-score confidence intervals. The results also suggest that larger sample sizes have been used in the last decade compared with those that were used in earlier decades.

References

Apr 1, 1966·Journal of Clinical Psychology·D J Shaw
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May 12, 2000·The Clinical Neuropsychologist·J R FolbrechtS M Dobbs
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Aug 10, 2000·Psychological Reports·R A Charter
Jan 10, 2002·Journal of Clinical and Experimental Neuropsychology·R A Charter
Jan 10, 2002·Journal of Clinical and Experimental Neuropsychology·R A Charter, L S Feldt

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Citations

Sep 14, 2007·Child Neuropsychology : a Journal on Normal and Abnormal Development in Childhood and Adolescence·Ana J Bridges, Karen A Holler
Oct 23, 2015·International Journal of Geriatric Psychiatry·Efstathios PapachristouS Goya Wannamethee
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Apr 29, 2016·Journal of Nursing Scholarship : an Official Publication of Sigma Theta Tau International Honor Society of Nursing·Yvonne Yueh-Feng LuJoan E Haase
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Dec 17, 2016·International Journal of Geriatric Psychiatry·Elise MansfieldRob Sanson-Fisher
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