Hi Stephanie,

We did find that there was a bug in the cem routine that was causing these missing strata. It shouldn't affect the weights or any output, but it did cause problems with the strata. To install a beta version that doesn't have this problem, you can run this code in Stata:

ado uninstall cem

net from https://dl.dropboxusercontent.com/u/5379343/

net install cem, force

Cheers,

Matt

~~~~~~~~~~~

Matthew Blackwell

Assistant Professor of Government

Harvard University

url: http://www.mattblackwell.org

On Mon, Feb 8, 2016 at 5:24 PM, Moulton, Stephanie <moulton.23@osu.edu> wrote:

Did you ever find a response to the question about STATA Output from CEM- matched observations with missing strata? We are finding the same problem with our data. None of the matching variables have missing data, yet many of the observations are being assigned to a “missing” stratum (complete with CEM weights for the missing stratum).

Any insights?

Thanks!

Stephanie Moulton

Associate Professor and Director of Doctoral Studies

John Glenn School of Public Affairs

The Ohio State University

http://glenn.osu.edu/faculty/glenn-faculty/moulton/

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