Histogramm for classes

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Description

Improvement of tapply(x, g, hist) with x and g taken from a data.frame

Usage

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groupHist(df, x, g, xlab = "", ylab = "", las = 1, main = NULL,
  unit = NA, ...)

Arguments

df

data.frame object name

x

column name of variable of interest

g

column name of groups (INDEX in tapply, f in split)

xlab, ylab

axis labels. DEFAULT: ""

las

LabelAxisStyle, see par. DEFAULT: 1, means numbers on y-axis upright

main

Main title, internal default based on d, x, unit and g. DEFAULT: NULL

unit

Unit to be written into the default title. DEFAULT: NA

...

further arguments passed to hist

Details

Uses split to categorize into groups.

Value

NULL, used for plotting

Author(s)

Berry Boessenkool, berry-b@gmx.de, Jan 2015

See Also

hist, tapply

Examples

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groupHist(chickwts, weight, "feed", col=2)
groupHist(chickwts, "weight", "feed", col=2, unit="grams at age 6 weeks")
groupHist(chickwts, weight, feed, col=2, breaks=20, main="Hi there")
groupHist(iris, Petal.Width, Species)

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