Ordering (sorting) rows of a data frame by the certain variables in the
data frame. This function is essentially a wrapper for the order()
function - the important difference being that variables to order by
can be given by a model formula.

Usage

orderBy(formula, data)

Arguments

formula

The right hand side of a formula

data

A data frame

Value

The ordered data frame

Details

The sign of the terms in the formula determines whether sorting should
be ascending or decreasing; see examples below