Comparison of Base R and RevoScaleR Functions

Articolo
10/11/2017

This article provides a list of the functions provided by the RevoScaleR package and lists comparable functions included in the base distribution of R.

Data Input and Output

rx function	Description	Nearest base R function
rxGetInfo	Retrieves header information from an .XDF file or summary information from a data frame	`str()` `names()` `colNames()`
rxGetVarInfo	Retrieves variable information from an .XDF file or data frame	`names()` `str()` `nrow()` `min()` `max()`
RxSasData	Creates a SAS data source object	`foreign::read.ssd()`
RxSpssData	Creates an SPSS data source object	`foreign::read.ssps()`
rxOpen	Opens a data source for reading	`read.table()` etc.
rxReadNext	Reads data from a data source	`read.table()`, etc.

Data Manipulation and Chunking

rx function	Description	Nearest base R function
rxDataStep	Transforms and subsets data in .XDF files or data frames	`transform()` `with()` `within()` `subset()`
rxFactors	Recodes a factor variable, or converts a non-factor variable into a factor	`factor()`
rxSort	Performs multi-key sorting of the variables in an .XDF file or data frame	`sort()` `order()`
rxMerge	Merges two .XDF files or two data frames using a variety of merge types	`merge()` `rbind()` `cbind()`
rxSplit	Splits an .XDF file or a data frame into multiple .XDF files or data frames	`split()`

Descriptive Statistics and Cross-Tabulation

rx function	Description	Nearest base R function
rxSummary	Generates summary statistics for a data frame, including computations by group	`summary()` `lapply(x, …)`
rxQuantile	Computes approximate quantiles for an .XDF file or data frame without sorting	`quantile()`
rxCrossTabs	Creates a cross-tabulation of data based on a formula provided as parameter	`xtabs()`
rxCube	Creates a cross-tabulation of data based on formula provided as parameter This function is an alternative to `rxCrossTabs` and is designed for efficient representation.	`xtabs()`
rxMarginals	Creates a marginal summary for an xtab object	`addmargins()` `colSums()` `rowSums()`
as.crosstabs	Converts cross tabulation results to an xtab object	`xtabs()`
rxChiSquaredTest	Performs a chi-squared test on an xtab object	`chisq.test()`
rxFisherTest	Performs Fisher's Exact Test on an xtab object	`fisher.test()`
rxKendallCor	Computes Kendall's Tau Rank Correlation Coefficient using an xtab object	`cor(…, method="kendall")`

Statistical Modeling

rx function	Description	Nearest base R function
rxLinMod	Fits a linear model to data	`lm()`
rxCovCor	Calculates the covariance, correlation, or sum of squares (cross-product) matrix for a set of variables	`cor()` `cov()` `crossprod()`
rxCov	Calculates the covariance matrix for a set of variables	`cov()`
rxCor	Calculates the correlation matrix for a set of variables	`cov()`
rxLogit	Fits a logistic regression model to data	`glm(…, family="binomial")`
rxGlm	Fits a generalized linear model to data	`glm()`
rxDTree	Fits a classification or regression tree to data	`tree::tree()` `rpart::rpart()`
rxPredict	Calculates predictions for fitted models	`predict()`
rxKmeans	Performs K-means clustering	`cluster::kmeans()`

Basic Graphing

rx function	Description	Nearest base R function
rxHistogram	Creates a histogram from data	`hist()`
rxLinePlot	Creates a line plot from data	`plot()` `lines()`

See Also

SQL Server R Services Features and Tasks