tindex: Simple function to create intra-group ranking and count...

In DerekYves/tindex: A Simple Package to Create Intra-group Ranking and Count Variables

Description

This function creates an index or count variable by group, optionally sorting on an additional parameter of interest. For example, one may create an index/ranking of income within some group, e.g. the median income of census tracts within counties of a state. Or, one may create a static count within some grouping variable, e.g. class size within a dataframe of test scores.

Usage

tindex(df, grp, sortvar = NULL, output = "index", desc = FALSE)

Arguments

df	character; an R data.frame
grp	character; a grouping variable, such as a subject number, a classroom, a county, etc.
sortvar	character; sorts the data within grp (see above) by an additional variable (e.g., mpg within cyl in matcars). If no variable df is specified, data are sorted by grp.
output	character; what type of output is desired, a within group "index" (the default) or a "count" within grp?
desc	logical; when TRUE, sortvar is sorted in descending order within grp.

Examples

# Build a count variable by number of cylinders, returning a vector:
mtcars$cylinder_count <- tindex(mtcars, cyl, output="count")

# Build a within-type index sorting by a second variable:
mtcars$ranked <- tindex(mtcars, cyl, sortvar=mpg, output="index", desc=TRUE)

DerekYves/tindex documentation built on May 6, 2019, 2:10 p.m.