sampleBy {SparkR}

R Documentation

Returns a stratified sample without replacement

Description

Returns a stratified sample without replacement based on the fraction given on each stratum.

Usage

sampleBy(x, col, fractions, seed)

## S4 method for signature 'SparkDataFrame,character,list,numeric'
sampleBy(x, col, fractions, seed)

Arguments

x	A SparkDataFrame
col	column that defines strata
fractions	A named list giving sampling fraction for each stratum. If a stratum is not specified, we treat its fraction as zero.
seed	random seed

Value

A new SparkDataFrame that represents the stratified sample

Note

sampleBy since 1.6.0

See Also

Other stat functions: approxQuantile(), corr(), cov(), crosstab(), freqItems()

Examples

## Not run: 
##D df <- read.json("/path/to/file.json")
##D sample <- sampleBy(df, "key", fractions, 36)
## End(Not run)

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