122 COMPARISONS
exact a logical indicating whether an exact p-value should be computed.
correct a logical indicating whether to apply continuity correction in the normal
approximation for the p-value.
conf.int a logical indicating whether a confidence interval should be computed.
conf.level confidence level of the interval.
formula a formula of the form lhs ~ rhs where lhs is a numeric variable giving
the data values and rhs a factor with two levels giving the corresponding
groups.
data an optional matrix or data frame (or similar: see model.frame) contain-
ing the variables in the formula formula. By default the variables are
taken from environment(formula).
subset an optional vector specifying a subset of observations to be used.
na.action a function