Pairwise formula special term

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.