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catalyst/zipline/finance
Eddie Hebert 643d556482 MAINT: Add empty values for risk metric calculated components.
eigen vales, covariance, etc. are not calculated until the first
return is passed through, so initialize this values to None, so that
`repr` and its ilk work on a freshly created `RiskMetricsIterative`
object.
2013-04-16 10:45:11 -04:00
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