groups List of the different patterns and the observation
numbers for each pattern
cn the names of the patterns coded as
vectors of 0-1's
tabcombthe pattern structure - all combinations of
zeros or missings in the variables
tabcombPlusthe pattern structure
- all combinations of zeros or missings in the variables including the size
of those combinations/patterns, i.e. the number of observations that belongs
to each pattern.
rsumthe number of zeros or missing values in each
row of the data set.
rindexthe index of zeros or missing values in each
row of the data set