Cross Tabulation and Table Creation
Upgrades table to a generic function and implements a method
for ff vectors which works for ff factors.
For other arguments passed on to table, uses table
table(..., exclude = if (useNA == "no") c(NA, NaN),
useNA = c("no", "ifany", "always"), dnn = list.names(...), deparse.level = 1)
table(..., exclude = if (useNA == "no") c(NA, NaN),
useNA = c("no", "ifany", "always"), dnn = list.names(...), deparse.level = 1)table.ff uses the cross-classifying factors to build a contingency table of
the counts at each combination of factor levels.
If ... does not contain factors, unique.ff will add a levels
attribute to the non-factors.
table object
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