Crosstabulations using formula
Functions to create contingency table using formula
xtab(formula, data, useNA = FALSE, exclude = c(NA,NaN), miss.char = "-",
na.action = na.exclude, subset = NULL, sparse = FALSE,
drop.unused.levels = FALSE)
Total(x)formula |
Object of class |
data |
data frame to use with formula |
useNA |
logical values to add NA to the levels in the table |
exclude |
levels to exclude from table |
miss.char |
Character to replace NA |
na.action |
methods to deal with NA |
subset |
subset to use in data |
sparse |
see |
drop.unused.levels |
logical values indicating whether we drop empty levels |
x |
numerical vector |
The xtab functions corrects the inability to deal with missing
values in the original xtabs that comes with R base. Total is
a utility function to use in conjunction with addmargins instead of sum.
xtab returns an object of type table (see
details). Total returns a sum with na.rm=TRUE by
default and replaces NA with 0.
Charles-Édouard Giguère
require(CUFF) ### example of crosstabs xtab( ~ N + P, npk)
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