3 Jan
2018
3 Jan
'18
10:29 a.m.
Hi Scott, if the coarsening is reasonable then large weights just indicate
lots of matches. It may be however that this is an opportunity to use more
fine grained coarsening since the larger of the two treatment regimes isn't
helping you that much. The reason is that the variance of a difference in
means is mostly a function of the smaller of the two means.
---
GaryKing.org
617-500-7570 <(617)%20500-7570>
On Dec 29, 2017 9:16 AM, "Scott Smith" <scott.al.smith(a)gmail.com> wrote:
In n:n coarsened exact matching, is there ever a situation where it makes
more sense to exclude study members and their respective control members
that have extremely large weights? For example, 500 study members match to
just 25 control members. Might it be better to exclude both study and
control members rather than introduce such large weights and variance to
the rest of the study population?
Thanks,
--
Scott Smith