order_by_summary: Order a factor by the summary statistic of another variable.

In mhairi/ordered: Ordering Factors Made Easy

Description

The factor and the order must be of the same length. The order is summarised by the levels of factor, using the summary function. The outcome of summarising is used to order the factor variable.

Usage

order_by_summary(factor, order, summary = sum, desc = FALSE, ...)

Arguments

factor	A factor or character vector.
order	A numeric.
summary	A function to apply to each subset of order which will return a single number
desc	Set to TRUE to order descending.
...	Further arguments to summary

Details

Ties are arbitrarily ordered.

Value

An ordered factor

Examples

factor = letters[rep(c(1, 2), 2)]
order = 1:4
order_by_summary(factor, order)

mhairi/ordered documentation built on May 22, 2019, 8:57 p.m.