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Statistical Inference for Generalized Yule Coefficients in 2 x 2 Contingency Tables

Iowa State University, Ames

Robert M. Price

East Tennessee State University, Johnson City

The odds ratio is one of the most widely used measures of association for 2 x 2 tables. A generalized Yule coefficient transforms the odds ratio into a correlation-like scale with a range from -1 to 1. Yule’s Y, Yule’s Q, Digby’s H, and a new coefficient are special cases of a generalized Yule coefficient. The new coefficient is shown to be similar in value to the phi coefficient. A confidence interval and sample size formula for a generalized Yule coefficient are proposed. The proposed confidence interval is shown to perform much better than the Wald intervals that are implemented in statistical packages.

Key Words: interval estimation • phi coefficient • sample size requirement • tetrachoric correlation

Sociological Methods & Research, Vol. 35, No. 3, 429-446 (2007)
DOI: 10.1177/0049124106292358


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