as.xtabs: Convert objects to xtabs format

In abd: The Analysis of Biological Data

Description

Currently able to convert a data frame or a matrix into an xtabs object.

Usage

as.xtabs(x,...)

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

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

Arguments

x	object (typically a data frame) to be converted to xtabs format
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 lables of the row variable.
...	additional arguments to be passed to or from methods.

Details

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

Value

An xtabs object.

Author(s)

Randall Pruim ([e-mail])

Examples

# 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) }

abd documentation built on May 2, 2019, 4:46 p.m.