proportions {base}

Express Table Entries as Fraction of Marginal Table

Description

Returns conditional proportions given margins, i.e., entries of x, divided by the appropriate marginal sums.

Usage

proportions(x, margin = NULL)
prop.table(x, margin = NULL)

Arguments

x

an array, usually a table.

margin

a vector giving the margins to split by. E.g., for a matrix 1 indicates rows, 2 indicates columns, c(1, 2) indicates rows and columns. When x has named dimnames, it can be a character vector selecting dimension names.

Value

A table or array like x, expressed relative to margin.

Note

prop.table is an earlier name, retained for back-compatibility.

Author(s)

Peter Dalgaard

See Also

marginSums.

apply and sweep are more general mechanisms for sweeping out marginal statistics.

Examples

m <- matrix(1:4, 2)
m
proportions(m, 1)

DF <- as.data.frame(UCBAdmissions)
tbl <- xtabs(Freq ~ Gender + Admit, DF)
tbl
proportions(tbl, "Gender")