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[2] Klein, Moeschberger (1997), Survival Analysis: Techniques for Censored and Truncated Data. ISBN-13: 978-0387948294

If in Fig 4 we see one or more subplot where the survival curves differ a lot, that is evidence that the feature expression affects the survival even after adjusting for the contribution of FactorA. To obtain an answer in terms of adjusted Log-rank and Wilcoxon p-values, one should deselect FactorA as a “group factor” (Fig 1) and mark it as a stratification factor instead (Fig 5). The computational of stratification adjusted p-values is elaborated in [2].

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