TwoGroups: Describe a Variable by a Factor with Two Levels

Description

This function describes a numeric variable by a grouping factor with two levels. First, a descriptive text listing the frequencies and means of the two groups and the results of the significance test is generated. The results of Desc(x~g) are reported as they are provided by the function, followed by a plot consisting of a density plot and a box plot. This description makes sense, for example, if the age distribution of a collective is to be represented for both sexes.

Usage

TwoGroups(x, ..., plotit = TRUE)
# S3 method for default
TwoGroups(x, g, main = NULL, vname = NULL, ..., plotit = TRUE)
# S3 method for formula
TwoGroups(formula, data, subset, na.action, ...)
# S3 method for TwoGroups
ToWrd(x, font = NULL, ..., wrd = DescToolsOptions("lastWord"))

Value

list with the results calculated by the used functions

Arguments

x: the numeric variable to describe.
g: the grouping factor (preferably with two levels.)
main: the main title.
vname: the variable names used in the description text.
plotit: boolean. Should a plot be created? Default can be defined by DescToolsOptions(plotit=TRUE/FALSE), if it does not exist then it's set to FALSE.
formula: a formula of the form lhs ~ rhs where lhs gives the data values and rhs the corresponding groups.
data: an optional matrix or data frame (or similar: see model.frame) containing the variables in the formula formula. By default the variables are taken from environment(formula).
subset: an optional vector specifying a subset of observations to be used.
na.action: a function which indicates what should happen when the data contain NAs. Defaults to getOption("na.action").
font: the first font will be chosen for the introducing text, when sending the output to Word, the second for the description.
wrd: the pointer to a running MS Word instance, as created by GetNewWrd() (for a new one) or by GetCurrWrd() for an existing one. Default is NULL, which will report all results to the console.
...: the dots are sent to the internally used function Phrase(). They can be used to choose the language (lang) or provide variable name (xname).

Author

Andri Signorell <andri@signorell.net>

Examples

Run this code

x <- d.pizza$temperature
g <- factor(d.pizza$rabate)

# we can change the colors for the plot by setting the DescToolsOptions
DescToolsOptions(col=c(horange, hgreen))
TwoGroups(x, g, main="Temperature ~ Rebate")

# for an output to Word simply define the wrd argument
# wrd <- GetNewWrd()
# TwoGroups(x, g, font.desc=list(name="Consolas", size=8),
#           main="Temperature ~ Rebate", wrd=wrd)