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Tests for linear trend and homogeneity among proportions and analogous time adjusted tests for life table data are programmed for stratified data. For proportions, the maximum likelihood estimator of the common logistic slope and its approximate standard error is given. This parameter is related to the relative risk for the factor under test. The model is a… (More)

- J Nam, J J Gart
- Biometrics
- 1985

The general method of the discrepancy or heterogeneity chi-square is applied to ABO-like data in which there are no observed double blanks in either the disease or the control group. When the recessive gene frequency is assumed zero, this method leads to an approximate chi-square test identical to that suggested by Smouse and Williams (1982, Biometrics 38,… (More)

Letters to the Editor SIR,-Dr Peto's recent editorial, Guidelines on the analysis of tumour rates and death rates in experimental animals (Br. J. Cancer, 1974, 29, 101) makes several recommendations for the statistical analysis of animal data from carcinogenesis experiments. Although much of the discussion is useful, some of the recommended statistical… (More)

Let P1 be the probability of a disease in one population and P2 be the probability of a disease in a second population. The ratio of these quantities, R = P1/P2, is termed the relative risk. We consider first the analyses of the relative risk from retrospective studies. The relation between the relative risk and the odds ratio (or cross-product ratio) is… (More)

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