Splitting a Dataset Revisited: Keeping Covariates Balanced Between Splits

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In my previous post I showed you how to randomly split up a dataset into training and testing datasets. (Thanks to all those who emailed me or left comments letting me know that this could be done using other means. As things go with R, it’s sometimes easier to write a new function yourself than it is to hunt down the function or package that already exists.)

What if you wanted to split a

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