as-xtabs: Convert objects to xtabs format

In mosaic: Project MOSAIC Statistics and Mathematics Teaching Utilities

Convert objects to xtabs format

Description

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
...	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.

Details

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

Value

An xtabs object.

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) }

mosaic documentation built on May 29, 2024, 5:27 a.m.