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## Really should be analysed by conditional logistic regression
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## Really should be analysed by conditional logistic regression
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## which is in the survival package
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## which is in the survival package
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if(require(survival)){
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if(require(survival)){
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  model3 <- clogit(case ~ spontaneous+induced+strata(stratum), data = infert)
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  model3 <- clogit(case ~ spontaneous+induced+strata(stratum), data = infert)
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  print(summary(model3))
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  print(summary(model3))
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  detach()# survival (conflicts)
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  detach()  # survival (conflicts)
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}
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}
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}
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}
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\keyword{datasets}
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\keyword{datasets}