A Simple Approximation for Calculating Sample Sizes for Detecting Linear Trend in Proportions
- 1 September 1987
- journal article
- research article
- Published by JSTOR in Biometrics
- Vol. 43 (3) , 701-705
- https://doi.org/10.2307/2532006
Abstract
A simple approximate formula for sample sizes for detecting a linear trend in proportions is derived. The formulas for both the uncorrected and corrected Cochran-Armitage test are given. For two binomial proportions these reduce to those given by Casagrande, Pike and Smith (1978, Biometrics 34, 483-486). Some numerical results of a power study for small sample sizes show that the nominal power corresponding to the approximate sample size is a reasonably good approximation to the actual power.This publication has 2 references indexed in Scilit:
- Statistical Issues in Interpretation of Chronic Bioassay Tests for CarcinogenicityJNCI Journal of the National Cancer Institute, 1979
- Trend and homogeneity analyses of proportions and life table dataComputers and Biomedical Research, 1977