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Data frames can be used in many RevoScaleR functions. Smaller data sets or excerpts from big data stored in an .xdf file can be read into an R data frame, and all of R's functionality is available for data frames 

This example reads the first 10 rows from the CensusWorkers .xdf file into a data frame: 

myCensusDF <- rxReadXdf(censusWorkers,numRows = 10)

and this example compares rxLinMod and lm results using the iris data: 

irisLinMod <- rxLinMod(Sepal.Length ~ Sepal.Width, data = iris) 
irisLM <- lm(Sepal.Length ~ Sepal.Width, data = iris, contrasts=list(Species = contr.SAS)) 

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