twoway {twoway}

Analysis of a two-way table with one observation per cell

Description

Fits an additive model using either row and column means or Tukey's median polish procedure

Usage

twoway(x, ...)

## Default S3 method:
twoway(x, method = c("mean", "median"), ...,
  name = deparse(substitute(x)), responseName = attr(x, "response"),
  varNames = names(dimnames(x)))

Arguments

x

a numeric matrix or data frame.

...

other arguments passed down

method

one of "mean" or "median"

name

name for the input dataset

responseName

name for the response variable

varNames

names for the Row and Column variables

Details

The rownames(x) are used as the levels of the row factor and the colnames(x) are the levels of the column factor. For a numeric matrix, the function uses the names(dimnames(x)) as the names of these variables, and, if present, a responseName attribute as the name for the response variable.

Value

An object of class c("twoway") with the following named components:

overall

the fitted constant term.

roweff

the fitted row effects.

coleff

the fitted column effects.

residuals

the residuals.

name

the name of the dataset.

rownames

the names for the rows

colnames

the names for the columns

method

the fitting method

varNames

the names of the row and column variables

responseName

the name of the response variable

compValue

the comparison values, for the diagnostic plot

slope

the slope value, for the diagnostic plot

power

the suggested power transformation, 1-slope

An object of class "twoway", but supplemented by additional components used for labeling

Author(s)

Michael Friendly

References

Tukey, J. W. (1977). Exploratory Data Analysis, Reading MA: Addison-Wesley. Friendly, M. (1991). SAS System for Statistical Graphics Cary, NC: SAS Institute

See Also

codetwoway.formula, codemedpolish

medianfit, meanfit

Examples

data(taskRT)
twoway(taskRT)