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Added note: per issue 514 Survival strata usage may cause some issues… #552

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statasaurus merged 1 commit into from
Mar 10, 2026
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Added note: per issue 514 Survival strata usage may cause some issues… #552

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2 changes: 2 additions & 0 deletions R/survival.qmd
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Expand Up @@ -129,6 +129,8 @@ survminer::surv_pvalue(fit.km.str, data = dat)

### Stratified Cox PH model

NOTE: if using {survival} package version 3.8.0 the below code works correctly (specifically with using survival::strata), however see [news](https://cran.r-project.org/web/packages/survival/news.html), changes were made to version 3.7-3 and 3.8.0 to ensure survival::strata() works the same as strata(). If using a {survival} package version prior to 3.8.0 **NEVER** use survival::strata() (instead use just strata(), otherwise the stratification variable isn't fitted as you expect. You can see this as it appears as a covariate in the output with hazard ratio estimated. Whereas, when fitted as a strata, it should not.

```{r}
fit.cox.str <- survival::coxph(
survival::Surv(LENFOLY, FSTAT) ~ AFB + survival::strata(GENDER),
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