This function returns Wald confidence intervals around the 
coefficients of a fitted pim object
confint(object, parm, level = 0.95, ...)# S4 method for pim
confint(object, parm, level = 0.95, ...)
# S4 method for pim.summary
confint(object, parm, level = 0.95, ...)
a pim or pim.summary object
a specification of which parameters are to be given confidence intervals. Either a vector of numbers or a vector of names. If missing, all parameters are considered
The confidence level required.
extra arguments to methods