adding relrisk() and modifying oddsRatio
unDeclared -> undeclared
MASS is a dependency now; don't require(MASS)
document parameters that were omitted before
import MASS; don't import dplyr twice
don't check for dplyr/MASS; using ugly ::: method -- need to improve this.
auto updates.
getting rid of collisions.R until I can figure out a better way to deal with select()