as.xtabs: Conversion of a RevoScaleR Cross Tabulation Object to an xtabs Object

Article
07/15/2019

Description

Converts objects containing cross tabulation results to an xtabs object.

Usage

 ## S3 method for class `rxCrossTabs':
as.xtabs  (x, ...)
 ## S3 method for class `rxCube':
as.xtabs  (x, ...)

Arguments

`x`

object of class rxCrossTabs or rxCube.

`...`

additional arguments (currently not used).

Details

This function converts an existing object of class rxCrossTabs or rxCube into an xtabs object. The underlying structure of the output object will be the same as that produced by an equivalent call to xtabs. However, you should expect the "call" attribute to be different, since it is a copy of the original call stored in the rxCrossTabs or rxCube input object. Often, this method can be used to coerce an object for use with the pmml package. RevoScaleR model objects that contain transforms or a transformFunc are not supported.

Value

an object of class xtabs.

Author(s)

Microsoft Corporation Microsoft Technical Support

Examples


 # Define function to compare xtabs and as.xtabs output
 "as.xtabs.check" <- function(convertedXtabsObject, xtabsObject)
 {
     attr(convertedXtabsObject, "call") <- attr(xtabsObject, "call") <- NULL
     all.equal(convertedXtabsObject, xtabsObject)
 }

 # Create a data set
 set.seed(100)
 divs <- letters[1:5]
 glads <- c("spartacus", "crixus")
 romeDF <- data.frame( division = rep(divs, 5L), 
                       score = runif(25, min = 0, max = 10), 
                       rank = runif(25, min = 1, max = 100), 
                       gladiator = c(rep(glads[1L], 12L), rep(glads[2L], 13L)),
                       arena = sample(c("colosseum", "ludus", "market"), 25L, replace = TRUE))

 # Compare xtabs and as.xtabs(rxCrossTabs(..., returnXtabs = FALSE))  
 # results for a 3-way interaction with no dependent variables
 z1 <- rxCrossTabs(~ division : gladiator : arena, data = romeDF, returnXtabs = FALSE)
 z2 <- xtabs(~ division + gladiator + arena, romeDF)
 as.xtabs.check(as.xtabs(z1), z2) # TRUE

 # Compare xtabs and as.xtabs(rxCube(...)) results for a 3-way interaction
 # with no dependent variable
 z1 <- rxCube(~ division : gladiator : arena, data = romeDF, means = FALSE)
 z2 <- xtabs(~ division + gladiator + arena, romeDF)
 as.xtabs.check(as.xtabs(z1), z2) # TRUE

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