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DOC: Add whatsnew for grouped top/bottom/rank.
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@@ -21,6 +21,11 @@ Enhancements
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- Filters have been made window_safe by default. Now they can be passed in as
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arguments to other Filters, Factors and Classifiers (:issue:`1338`).
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- Added an optional ``groupby`` parameter to
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:meth:`~zipline.pipeline.factors.Factor.rank`,
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:meth:`~zipline.pipeline.factors.Factor.top`, and
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:meth:`~zipline.pipeline.factors.Factor.bottom`. (:issue:`1349`).
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Bug Fixes
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~~~~~~~~~
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