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+   print(summary(model3))
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+   print(summary(model3))
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+   detach("package:survival", unload = TRUE)  # survival (conflicts)
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+   detach("package:survival", unload = TRUE)  # survival (conflicts)
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+ }
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+ }
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Loading required package: survival
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Loading required package: survival
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Call:
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Call:
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coxph(formula = Surv(rep(1, 248L), case) ~ spontaneous + induced +
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coxph(formula = Surv(1 + 0 * case, case) ~ spontaneous + induced +
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    strata(stratum), data = infert, method = "exact")
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    strata(stratum), data = infert, method = "exact")
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  n= 248, number of events= 83
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  n= 248, number of events= 83
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              coef exp(coef) se(coef)     z Pr(>|z|)
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              coef exp(coef) se(coef)     z Pr(>|z|)