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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.

order()

order_by(data, formula)orderBy(formula, data)

orderBy(formula, data)

The ordered data frame

A dataframe

The right hand side of a formula

Søren Højsgaard, sorenh@math.aau.dk and Kevin Wright

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

transformBy, transform_by, splitBy, split_by

transformBy

transform_by

splitBy

split_by

orderBy(~ conc + Treatment, CO2) ## Sort decreasingly by conc orderBy(~ - conc + Treatment, CO2)

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