Creates a matrix representing all possible combinations of n.pair variables.
Each row corresponds to a unique combination, and each column represents a variable
where 1 indicates inclusion and conj indicates exclusion.
p.combos(n.pair, conj = 0)A matrix with 2^n.pair rows and n.pair columns, where each row is a unique combination of 1s and conj values.
Integer. Number of predictors in the combination.
Numeric. Value denoting absence of a variable in a combination (default is 0).
Bethany Wolf wolfb@musc.edu
This is an internal function called by prime.imp and is not intended for independent use.