brkdn {prettyR}R Documentation

Breakdown of a numeric variable by grouping variable(s)

Description

Calculates means, variances and ns for subgroups of numeric observations and displays the results.

Usage

 brkdn(formula,data,maxlevels=10,num.desc=c("mean","var","valid.n"),
  vname.width=NULL,width=10,round.n=2)

Arguments

formula a formula with the variable to be broken down on the left and the names of one or more variables defining subgroups on the right
data the data frame from which to select the variables
maxlevels the maximum number of levels in any subgroup
num.desc names of the summary functions to apply to the variable on the left side of the formula
vname.width The number of characters to allow for printing the variable name. If NULL, the function will calculate this.
width The number of characters to allow for each column in the summary output.
round.n The number of decimal places to round the output.

Details

brkdn will accept a formula referring to columns in a data frame. It calls describe.numeric for the calculations and displays a table of results.

Value

The results of describe.numeric, or a multi-level list if more than one grouping variable is specified.

Author(s)

Jim Lemon

See Also

describe.numeric

Examples

 test.df<-data.frame(Age=rnorm(100)+3*10,Sex=sample(c("M","F"),100,TRUE),
  Employ=sample(c("FT","PT","NO"),100,TRUE))
 # add value labels for Employ in alphabetical order so they match
 attr(test.df$Employ,"value.labels")<-c("Full time","None","Part time")
 brkdn(Age~Sex+Employ,test.df)

[Package prettyR version 1.4 Index]