mosaic (version 0.14.4)

as.xtabs: Convert objects to xtabs format

Description

Convert a data frame or a matrix into an xtabs object.

Usage

as.xtabs(x, ...)

# S3 method for data.frame as.xtabs(x, rowvar = NULL, colvar = NULL, labels = 1, ...)

# S3 method for matrix as.xtabs(x, rowvar = NULL, colvar = NULL, ...)

Arguments

x

object (typically a data frame) to be converted to xtabs format

...

additional arguments to be passed to or from methods.

rowvar

name of the row variable as character string

colvar

name of the column variable as character string

labels

column of data frame that contains the labels of the row variable.

Value

An xtabs object.

Details

The intended use is to convert a two-way contingency table stored in a data frame or a matrix into an xtabs object.

Examples

Run this code
# NOT RUN {
# example from example(fisher.test)
df <- data.frame( X=c('Tea','Milk'), Tea=c(3,1), Milk=c(1,3) )
xt <- as.xtabs(df, rowvar="Guess", colvar="Truth"); xt
if (require(vcd)) { mosaic(xt) }
# }

Run the code above in your browser using DataLab