keepMax: De-duplicating while Retaining Max

In HFBrowning/EnvEpi: Common Functions for Environmental Epidemiology

Description

This function returns unique entries from a data frame with the highest value in a specified column of interest.

Usage

keepMax(df, x, value, max = TRUE)

Arguments

df	A dataframe
x	A character vector of column names to remove on
value	A character entry to sort on and keep the largest (or smallest) value
max	Optional parameter to keep max or min value. Defaults to keeping max.

Details

This function is specifically for fulfilling common data-call requests. An example is radon measurements at residences each year. If a given residence has more than one measurement in a given year, only the most elevated test should be sent.

Examples

data(iris)
x <- c("Petal.Length", "Petal.Width")
value <- "Sepal.Length"
keepMax(iris, x, value)

HFBrowning/EnvEpi documentation built on May 6, 2019, 9:46 p.m.