sampleBy: Returns a stratified sample without replacement

In SparkR: R Front End for 'Apache Spark'

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: 
df <- read.json("/path/to/file.json")
sample <- sampleBy(df, "key", fractions, 36)

## End(Not run)

SparkR documentation built on June 3, 2021, 5:05 p.m.