| Alpha Inflation? The Impact of Eliminating Scale Items on Cronbach's Alpha |
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| 收稿时间： | 1996-10-24 |
Alpha Inflation? The Impact of Eliminating Scale Items on Cronbach's Alpha |
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| Praveen K. Kopalle,Donald R. Lehmann. Alpha Inflation? The Impact of Eliminating Scale Items on Cronbach's Alpha[J]. Organizational behavior and human decision processes, 1997, 70(3): 189-197. DOI: 10.1006/obhd.1997.2702 |
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| Authors: | Praveen K. Kopalle Donald R. Lehmann |
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| Affiliation: | aThe Amos Tuck School of Business Administration, Dartmouth College;bGraduate School of Business, Columbia University |
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| Abstract: | In this paper, we study the effect of the elimination of items from a scale so that only those items that correlate highly are chosen. Using a simulation, we estimate the impact on Cronbach's alpha as a function of the total number of items in a scale, the number of items chosen, the true correlation among the items, and the sample size. The results suggest that a substantial effect can exist. Not surprisingly, the effect is larger when sample sizes are smaller, when a smaller fraction of the original items is retained, and when there is greater variation in the true item-total correlations of the measures. |
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