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| From | Sergiy Radyakin <serjradyakin@gmail.com> |
| To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
| Subject | Re: st: Obtaining details about -merge, update- |
| Date | Fri, 18 Oct 2013 17:45:29 -0400 |
IMHO this task would have memory requirements to fit both original and patch data into memory. If this is possible, then I don't see a problem implementing this. If it is not possible, then it becomes more challenging (and more interesting). Does anybody have a formula to compute, how much memory does standard 'merge' require? Best, Sergiy Radyakin On Fri, Oct 18, 2013 at 4:48 PM, Nicole Boyle <nicboyle@gmail.com> wrote: > I'm unaware of a method that summarizes merge details per variable. > However, on multiple occasions, I've needed such a method, so I second > your request! > > Nicole Boyle > > On Fri, Oct 18, 2013 at 1:09 PM, Joe Canner <jcanner1@jhmi.edu> wrote: >> Dear Colleagues, >> >> Is there a relatively simple way to find out exactly what happened in the course of a -merge, update- command? In other words: I have two datasets with a number of overlapping variables and I want to find out how often, for each variable, a missing observation in the master was updated with a non-missing observation in the using dataset. Likewise, how often were observations in the master no updated because of a non-missing conflict. Basically, this would be similar to the current merge results table, but on a variable-by-variable basis rather than based on the dataset as a whole. >> >> Of course, this same functionality would be useful for -merge, replace-, although that is not my present concern. >> >> If the answer is "no", is this something that people would be interested in? >> >> Regards, >> Joe Canner >> Johns Hopkins University School of Medicine >> >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/faqs/resources/statalist-faq/ >> * http://www.ats.ucla.edu/stat/stata/ > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/