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J Dent Res 49(4): 768-771, 1970
© 1970 International and American Associations for Dental Research
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Studies in the Design and Analysis of Dental Experiments: 12. Comparison of Two Measurements of Root Divergence

J. W. FERTIG 1, N. W. CHILTON 1, and A. A. O. VARMA 1

1 School of Public Health and Administrative Medicine, Columbia University Faculty of Medicine, New York, NY 10032

In odontometric studies, root divergence can be expressed in terms of the ratio of the projected root length to the actual root length (cosine) or as the actual angle itself. Since the distribution of the cosines is skewed and the distribution of the angles is rather symmetrical, the angle measurement is preferable. Various types of significance tests with either measurement will generally not differ greatly, because of the insensitive (robust) nature of these tests.

Submitted on June 17, 1969






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