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Merge pull request #450 from arisliang/patch-5

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Update report.rst
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@@ -101,7 +101,7 @@ Graphical Result
- Axis Y:
- `ic`
The `Pearson correlation coefficient` series between `label` and `prediction score`.
In the above example, the `label` is formulated as `Ref($close, -1)/$close - 1`. Please refer to `Data Featrue <data.html#feature>`_ for more details.
In the above example, the `label` is formulated as `Ref($close, -1)/$close - 1`. Please refer to `Data Feature <data.html#feature>`_ for more details.
- `rank_ic`
The `Spearman's rank correlation coefficient` series between `label` and `prediction score`.