mids objects x
and y into a single mids object. The two
mids objects should have the same underlying
multiple imputation model and should be fitted on exactly
the same dataset. If the number of imputations in
x is m(x) and in y is m(y)
then the combination of both objects contains
m(x)+m(y) imputations.ibind(x, y)mids object.mids object.midsmids,
rbind.mids, cbind.mids