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R is niche, but it's the language every statistician actually uses
It may be niche, but it's a big niche in a data-driven world.
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# Many of the MultiIndex slicing operations will fail if the index is not sorted. # The multiindex is not sorted lexographically.
pd.MultiIndex.from_arrays([['a', 'a', 'b', 'b'], [1, 2, 1, 2]]) pd.MultiIndex.from_tuples([('a', 1), ('a', 2), ('b', 1), ('b', 2)]) pd.MultiIndex.from_product([['a ...
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