prettyR (version 1.0-4)

xtab: Crosstabulate variables

Description

Crosstabulates variables with small numbers of unique values.

Usage

xtab(formula,data,varnames=NULL,chisq=FALSE,phi=FALSE)

Arguments

formula

a formula containing the variables to be crosstabulated

data

the data frame from which to select the variables

varnames

optional labels for the variables (defaults to names(data))

chisq

logical - whether to display chi squared test(s) of the table(s)

phi

whether to calculate and display the phi coefficient of association - only for 2x2 tables

Value

• The result of calculate.xtab if there is only one table to display, otherwise nil.

Details

xtab will accept a formula referring to columns in a data frame or two explicit variable names. It calls calculate.xtab for the calculations and displays one or more tables of results by calling print.xtab.

See Also

table, calculate.xtab, print.xtab

Examples

test.df<-data.frame(sex=sample(c("MALE","FEMALE"),1000,TRUE),
 suburb=sample(1:4,1000,TRUE),social.type=sample(LETTERS[1:4],1000,TRUE))
 xtab(sex~suburb+social.type,test.df,chisq=TRUE)