[cem] Stata Output from CEM - matched observations with missing strata

Dear CEM list - After running the CEM, the cem_matched variable indicates that 100,552 (97,161 controls to 3,391 treatment) of my observations are matched. However, of these, 86,261 or 85%, are missing the cem_strata variable. I quickly looked through the data and cem_weights have been attached as well. Any potential suggestions as to what is going on? Many Thanks, Ethan __________________________________________________________________________ This email message is for the sole use of the intended recipient(s) and may contain confidential information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. - cem Mailing List, served by Harvard-MIT Data Center Send messages: cem(a)lists.gking.harvard.edu [un]subscribe Options: http://lists.gking.harvard.edu/?info=cem More information on cem: http://gking.harvard.edu/cem