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Pairwise Formula Special Term

Source: R/coxph.R
pairwise.Rd

[Stable]

The special term pairwise indicate that the model should be fitted individually for every tested level in comparison to the reference level.

Usage 

pairwise(x)

Arguments

x

the variable for which pairwise result is expected

Details

Let's ARM being a factor with level A, B, C; let's be B the reference level, a model calling the formula including pairwise(ARM) will result in two models:

  • A model including only levels A and B, and effect of A estimated in reference to B.

  • A model including only levels C and B, the effect of C estimated in reference to B.