pandas.core.resample.Resampler.transform
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Resampler.transform(arg, *args, **kwargs)[source]
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Call function producing a like-indexed Series on each group and return a Series with the transformed values Parameters: func : function To apply to each group. Should return a Series with the same index Returns: transformed : Series Examples>>> resampled.transform(lambda x: (x - x.mean()) / x.std()) 
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Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.core.resample.Resampler.transform.html