These functions may be used as contents arguments to the
function stat.table. They are defined internally in
stat.table and have no independent existence.
count(id)
ratio(d,y,scale=1, na.rm=TRUE)
percent(...)numeric vector in which identical values identify the same individual.
numeric vectors of equal length (d for Deaths,
y for person-Years)
a scalar giving a value by which the ratio should be multiplied
a logical value indicating whether NA values should
be stripped before computation proceeds.
a list of variables taken from the index argument
to stat.table
When used as a contents argument to stat.table, these
functions create the following tables:
countIf given without argument (count()) it
returns a contingency table of counts. If given an id
argument it returns a table of the number of different values of
id in each cell, i.e. how many persons contribute in each
cell.
ratioreturns a table of values
scale * sum(d)/sum(y)
percentreturns a table of percentages of the
classifying variables. Variables that are in the index
argument to stat.table but not in the call to
percent are used to define strata, within which the
percentages add up to 100.