sdf_weighted_sample: Perform Weighted Random Sampling on a Spark DataFrame

In sparklyr: R Interface to Apache Spark

Perform Weighted Random Sampling on a Spark DataFrame

Description

Draw a random sample of rows (with or without replacement) from a Spark DataFrame If the sampling is done without replacement, then it will be conceptually equivalent to an iterative process such that in each step the probability of adding a row to the sample set is equal to its weight divided by summation of weights of all rows that are not in the sample set yet in that step.

Usage

sdf_weighted_sample(x, weight_col, k, replacement = TRUE, seed = NULL)

Arguments

x	An object coercable to a Spark DataFrame.
weight_col	Name of the weight column
k	Sample set size
replacement	Whether to sample with replacement
seed	An (optional) integer seed

See Also

Other Spark data frames: sdf_copy_to(), sdf_distinct(), sdf_random_split(), sdf_register(), sdf_sample(), sdf_sort()

sparklyr documentation built on May 29, 2024, 2:58 a.m.