From 9e31d830847252923b2512926056a2359b0abbb3 Mon Sep 17 00:00:00 2001 From: Eddie Hebert Date: Thu, 17 Jan 2013 18:11:27 -0500 Subject: [PATCH] Fixes check of ticks in stddev, now that __len__ has been removed. --- zipline/transforms/stddev.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/zipline/transforms/stddev.py b/zipline/transforms/stddev.py index 454892c7..1f144c07 100644 --- a/zipline/transforms/stddev.py +++ b/zipline/transforms/stddev.py @@ -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: