Matt,
Here is the code:
imb sfla bestages1 acres avlandpct, tr(pv) //to examine the imbalance
set seed 25444555
cem sfla(1000 1700 2800 5000) bestages1(-2 1 15 100) acres(0.05 0.14 0.75 10) ///
avlandpct(3 25 50 85) sy1(#0) bgcode(#0) , tr(pv)
Here are summary stats for all the variables in the command, by the treatment variable:
It looks like I did not store the output diagnostics. I will rerun and send them to you when I have them later tonight.
Ben
Ben Hoen
LBNL
Office: 845-758-1896
Cell: 718-812-7589
From: Matt Blackwell [mailto:m.blackwell@rochester.edu]
Sent: Thursday, September 11, 2014 5:00 PM
To: Ben Hoen
Cc: cem@lists.gking.harvard.edu; Ariel Linden
Subject: Re: cem_matched ==1 and cem_strata==. <missing>
Hi Ben,
Can you send the original code that you ran to call cem? We've seen this error before but haven't been able to replicate it.
Cheers,
Matt
~~~~~~~~~~~
Matthew Blackwell
Assistant Professor of Government
Harvard University
On Thu, Sep 11, 2014 at 1:27 PM, Ben Hoen <bhoen@lbl.gov> wrote:
Just trying you again… (Matt & Ariel am trying your emails too)
Any idea why I would be getting such a high % of missing.
In my dataset I have 30,473 cases where “cem_matched” ==1 (25,090 control, 5,383 treated). Of those 14,245 have a “cem_strata” ==. (11,624 control, 2,621 treated).
FYI, here is an output of the weights (cem1w) – treatment is pv, control is non-pv
Thanks for any help you might be able to offer.
Ben
From: Ben Hoen [mailto:bhoen@lbl.gov]
Sent: Tuesday, September 09, 2014 3:43 PM
To: cem@lists.gking.harvard.edu
Subject: cem_matched ==1 and cem_strata==. <missing>
Hi all,
I had been using a cem matching output to run regressions and have just now found that a large set of the output has the variable “cem_matched” ==1 while the “cem_strata” ==. (a.k.a. missing). For those cases, there is also a weight stored in “cem_weights”.
Is this a common occurance? If so, would you be able to explain when/why this occurs?
Ben
Ben Hoen
Staff Research Associate
Lawrence Berkeley National Laboratory
Office: 845-758-1896
Cell: 718-812-7589
http://emp.lbl.gov/staff/ben-hoen
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