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Journal of Dental Research, Vol 62, 992-996, Copyright © 1983 by International & American Associations for Dental Research Online Journals

ARTICLES

Estimates of the gain in power utilizing transformations of DMFS scores

M. R. Smith and J. T. Rule

More than 100,000 clinical caries trials were simulated utilizing the negative binomial distribution on a UNIVAC 1100 computer. In each trial, the raw data and logarithmic transformed data were analyzed using a standard t test analysis. The results were summarized as estimates of the power functions for each case. In almost all cases, the transformed data gave greater power than did the untransformed data. In several common situations, the differences were dramatic.




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