From 5ed8511075ba12dd2a8ed9f533890c6e35fafca8 Mon Sep 17 00:00:00 2001 From: Matthew Gilbert Date: Wed, 7 Oct 2015 21:53:28 -0400 Subject: [PATCH] DOC: Included halflife as one 3 optional params that must be specified --- pandas/stats/moments.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/pandas/stats/moments.py b/pandas/stats/moments.py index 2e13082ee5366..c4791c43278b9 100644 --- a/pandas/stats/moments.py +++ b/pandas/stats/moments.py @@ -97,7 +97,7 @@ _ewm_notes = r""" Notes ----- -Either center of mass or span must be specified +Either center of mass, span or halflife must be specified EWMA is sometimes specified using a "span" parameter `s`, we have that the decay parameter :math:`\alpha` is related to the span as