famids
famids is a character or integer vector that specifies the family
order in a "bootstrapped" fashon. Each index of famids is the famid
(family identifier) from the original dataset not the index of the
family. An example famids argument would be
famids <- sample(famid, length(unique(famid)), replace = TRUE)
.
IMPORTANT NOTE: This sequence of famids must be the same as that passed to
expand.multic. If they are not, the dataset and the external data
will not match.