as_idata                Create individual data frame from a covset
                        object
build_covform           Build a object or formula to use with covset.
covset                  Covobj and covset objects.
dmutate                 mutate a data frame, adding random variables.
mutate_random           Add random variates to a data frame.
rbinomial               Simulate from binomial distribution.
rmvnorm                 Simulate from multivariate normal distribution.
