Re: [cem] Two different Stata versions, two different cem problems

Try uninstalling and reinstalling the program. This sometimes fixes the problem…**** ** ** Ariel**** ** ** *From:* cem-bounces(a)lists.gking.harvard.edu [mailto: cem-bounces(a)lists.gking.harvard.edu] *On Behalf Of *Katelyn Sack *Sent:* Friday, June 29, 2012 8:24 PM *To:* Matt Blackwell *Cc:* cem(a)lists.gking.harvard.edu *Subject:* Re: [cem] Two different Stata versions, two different cem problems**** ** ** Hi, **** ** ** Thanks. The mata lines of code did indeed add the cem library and fix the first error in Stata 10, but the second error remains in both versions. ** ** ** ** The error is "cem_weights not found r(111);" and it follows attempts to run difference-in-differences regression after pre-processing the data with cem. Maybe there is a better syntax to run DND accounting for cem? I'm telling Stata "reg lblackproportion POLYEXAM YP YEAR [iweight=cem_weights]." **** ** ** Many thanks, **** Katelyn**** ** ** On Fri, Jun 29, 2012 at 7:41 PM, Matt Blackwell &lt;blackwel(a)fas.harvard.edu&gt; wrote:**** For the stata 10 code, one problem might be that Stata is**** not finding the library. When you open up Stata, try running the**** following line of code:**** ** ** mata: mata mlib query**** ** ** (with the colon and double-mata and everything) This should list some**** libraries all starting with the letter l ("el"). One of the should be**** "lcem." If it isn't, try running this line of code (which may take a**** bit):**** ** ** mata: mata mlib index**** ** ** Hopefully now you should see "lcem." The program should work after**** this. If this does not work, I have a few more ideas, but I think this**** should resolve the issue.**** ** ** For Stata 12, I think you have combined two separate commands. You want to run everything before "reg". Should be the same command as in Stata 10. ** ** ** ** Please let me know if this does not help.**** ** ** cheers,**** matt. **** ** ** ** ** ~~~~~~~~~~~**** Matthew Blackwell**** PhD Candidate**** Institute for Quantitative Social Science**** Department of Government**** Harvard University**** url: http://people.fas.harvard.edu/~blackwel/**** On Friday, June 29, 2012 at 3:55 PM, Katelyn Sack wrote:**** Hi Matt & all, **** ** ** Thanks. My bad - that was a "replicating my error" error. Fixing it generates the following errors: **** cem AGCYTYPE POPULATION region lblackproportion, tr(POLYEXAM)**** <istmt>: 3499 cemStata() not found**** r(3499);**** (Stata 10 still seems to get stuck trying to find cem.)**** ** ** And the same error as before in Stata 12:**** cem AGCYTYPE POPULATION region lblackproportion, tr(POLYEXAM)**** reg lblackproportion POLYEXAM YP YEAR [iweight=cem_weights]**** cem_weights not found**** r(111);**** ** ** Any other ideas how to troubleshoot?**** ** ** Thanks and best, **** Katelyn**** ** ** ** ** On Fri, Jun 29, 2012 at 6:38 PM, Matt Blackwell &lt;blackwel(a)fas.harvard.edu&gt; wrote: **** Hi Katelyn, **** ** ** Without taking too close a look, I think that the problem with the Stata 10 code is the space between "tr" and "(". It should be "tr(POLYEXAM)". That might also be the problem in Stata 12. **** ** ** Cheers,**** Matt. **** On Friday, June 29, 2012 at 1:39 PM, Katelyn Sack wrote:**** Dear list, **** ** ** When I try using cem in Stata 10,* *I get the error* "*no variables defined in option treatment(), r(111);" even though my syntax looks fine. (My command was "cem AGCYTYPE POPULATION region lblackproportion, tr (POLYEXAM).") The website <http://gking.harvard.edu/cem/> indicates it works in version 10. **** ** ** When I try using it in Stata 12, I think the program gets a little farther. But I still get the error "cem_weights not found" after the commands:**** cem AGCYTYPE POPULATION region lblackproportion, tr (POLYEXAM)**** reg lblackproportion POLYEXAM YP YEAR [iweight=cem_weights]**** ** ** Any ideas how to troubleshoot? My best guess is that I skipped important pre-cem steps and the program is protesting that sort of human error. Perhaps the matched N (672) is too small and so I should simulate more data to produce more matches?**** ** ** Many thanks, **** Katelyn**** ** ** -- **** Katelyn Sack, Ph.D. candidate**** University of Virginia **** ** ** -**** --**** cem Mailing List, served by HUIT**** 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**** Cem mailing list**** Cem(a)lists.gking.harvard.edu**** https://lists.gking.harvard.edu/mailman/listinfo/cem**** ** ** **** ** ** -- **** Katelyn Sack, Ph.D. candidate**** University of Virginia **** ** ** ** ** **** ** ** -- **** Katelyn Sack, Ph.D. candidate**** University of Virginia **** ** **