In these tests, I am verifying that the IDs really are unique in the two datasets that I have. Tests 1 and 2 are unnecessary when I plan later tomerge 1:1because the1:1part will cause Stata itself to check that
There are only 3 observations in your master dataset, yet, when you do the merge, there are 4 observations that have a_mergecode of 3 (meaning the observations are in both datasets). Cause: There are duplicates in the using dataset. ...
As you are aware, the inefficiency comes because you are churning datasets. You may be able to avoid this by putting the "events" data into a matrix, then doing the matching with the "compustat" data current throughout, something like this (Stata 9 approach, better endowed people would pro...
use " C:\Users\Hp\Desktop\datasets\nepal_dhs\NPPR82DT\NPPR82FL.DTA " gen in_PR=1 tab1 in* gen cluster=hv001 gen hh=hv002 gen line=hvidx gen id=HHID sort cluster hh line id * Merge PR with IR merge 1:1 cluster hh line using IRtemp.dta rename _merge merge_PR_IR * Merge...
To "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> Subject st: looping command for duplicates and merging datasets by matching dates Date Fri, 12 Jul 2013 12:38:10 +0000Hi Everybody, I am struggling over the last week with data cleaning for a dataset that has got mul...
I did not elaborate on this, but it is only a simple commandline option with mmerge.ado. In the example I posted earlier today the command was: use A mmerge city using B, ukeep(income) replace update On the second line note the option "ukeep(income)". This tells Stata that of th...
However, it can cause problems with id variables: it is not uncommon that ids are generated such that they contain more than 8 digits, and in order for them to match between datasets they need to be stored exactly. So you need to make sure that when this is the case, you import your...