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Fixes check of ticks in stddev, now that __len__ has been removed.

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Eddie Hebert
2013-01-17 18:11:27 -05:00
parent dbcfc0a2a5
commit 9e31d83084
1 changed files with 1 additions and 1 deletions
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zipline/transforms/stddev.py
+1 -1
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@@ -147,7 +147,7 @@ class MovingStandardDevWindow(EventWindow):
"""
# Sample standard deviation is undefined for a single event or
# no events.
if len(self) <= 1:
if len(self.ticks) <= 1:
return None
else: