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catalyst/zipline/finance/risk
Thomas Wiecki 6a41faf474 MAINT: Make beta calculation robust to missing values.
Risk calculations are robust to nans, except for
beta which calls numpy with the complete list of
algorithm_returns. If nans are present the result
of covar will be nan.

This is fixed by filtering out nans in
algorithm_returns.
2015-01-02 16:00:37 +01:00
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