Stratified Sampling using R or Python [duplicate]

Question

I have a dataset with 400K observations and 250 features. I would like to perform the stratified sampling.

I referred many links, but they are all after 1 or two variables examples including Target.

Can anybody please help me how should be performing stratified sampling using R / Python.

thanks in Adavance !

stratified on what? one one variable? is it the y? is it numerical or categorical? — missuse
– missuse, Commented Jun 13, 2018 at 7:29

Wimpel · Accepted Answer · 2018-06-13 07:52:04Z

0

If you first group your data.frame, you can sample each group using dplyr's sample_n()

library(dplyr)
sample.df <- df %>% group_by( ID ) %>% sample_n( 10 )

answered Jun 13, 2018 at 7:52

Wimpel

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