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ENH: GH12042 Add parameter
drop_first
to get_dummies to get n-1 var…
…iables out of n levels. closes #12042 Some times it's useful to only accept n-1 variables out of n categorical levels. Author: Bran Yang <[email protected]> Closes #12092 from BranYang/master and squashes the following commits: 0528c57 [Bran Yang] Compare with empty DataFrame, not just check empty 0d99c2a [Bran Yang] Test the case that `drop_first` is on and categorical variable only has one level. 45f14e8 [Bran Yang] ENH: GH12042 Add parameter `drop_first` to get_dummies to get k-1 variables out of n levels.
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