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Re: Merging DHS data in Stata [message #2496 is a reply to message #2488]

Mon, 30 June 2014 13:20

Bridgette-DHS
Messages: 3043
Registered: February 2013

Senior Member

Following is a response from DHS Senior Specialist, Tom Pullum:

You are right to be concerned about whether the merge was correct. It is very easy to make a mistake when merging. The way I would do it is given below. You can change the paths and run it.

During a merge, a variable called "_merge" is constructed. The codes for it are given in "help merge". In your case, you will want to keep the cases with _merge=3. In the lines below I construct "in_PR=1" and "in_IR=1" in the PR and IR files, respectively, and if you run the code you will see that the cases in the merged file with _merge=3 are exactly the same as those with in_PR=1 AND in_IR=1. I sometimes add this extra check to be absolutely sure that I have what I want.

You have to save the sorted PR file. You should save it with another name. Never over-write the basic recode files. I use old syntax for the merge command. I know some other people do too. The current syntax doesn't always mean what you think it means. I dropped the lines to recast v001 and v002. They are not needed. I used rename instead of gen to get v001 and v002 in the PR file. You can do things like that in temporary or scratch files.

Let us know if you have other questions.

use c:\DHS\DHS_data\PR_files\PKPR61FL.dta, clear
rename hv001 v001
rename hv002 v002
gen in_PR=1
sort v001 v002

save c:\DHS\DHS_data\scratch\temp.dta, replace

use c:\DHS\DHS_data\IR_files\PKIR61FL.dta, clear
gen in_IR=1
sort v001 v002
merge v001 v002 using c:\DHS\DHS_data\scratch\temp.dta

tab1 _merge in_PR in_IR

keep if in_PR==1 & in_IR==1

tab _merge
drop _merge

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[Message index]

		Merging DHS data in Stata By: DHS user on Wed, 20 February 2013 11:45
		Re: Merging DHS data in Stata By: Bridgette-DHS on Wed, 20 February 2013 11:46
		Re: Merging DHS data in Stata By: kf2349 on Tue, 26 March 2013 16:20
		Re: Merging DHS data in Stata By: Bridgette-DHS on Thu, 28 March 2013 09:25
		Re: Merging DHS data in Stata By: jack.murphy on Tue, 15 November 2016 11:26
		Re: Merging DHS data in Stata By: Bridgette-DHS on Wed, 16 November 2016 09:32
		Re: Merging DHS data in Stata By: jack.murphy on Thu, 17 November 2016 16:53
		Re: Merging DHS data in Stata By: Bridgette-DHS on Fri, 18 November 2016 10:31
		Re: Merging DHS data in Stata By: jack.murphy on Fri, 18 November 2016 11:28
		Re: Merging DHS data in Stata By: jack.murphy on Fri, 18 November 2016 11:38
		Re: Merging DHS data in Stata By: Bridgette-DHS on Fri, 18 November 2016 14:36
		Re: Merging DHS data in Stata By: jack.murphy on Fri, 18 November 2016 14:37
		Re: Merging DHS data in Stata By: Hassen on Sun, 06 May 2018 05:58
		Re: Merging DHS data in Stata By: caragh on Tue, 02 April 2013 18:46
		Re: Merging DHS data in Stata By: Bridgette-DHS on Tue, 09 April 2013 12:07
		Re: Merging DHS data in Stata By: owraza on Sat, 28 June 2014 20:38
		Re: Merging DHS data in Stata By: Bridgette-DHS on Mon, 30 June 2014 13:20
		Re: Merging DHS data in Stata By: owraza on Wed, 02 July 2014 07:24
		Re: Merging DHS data in Stata By: Bridgette-DHS on Wed, 02 July 2014 10:21
		Re: Merging DHS data in Stata By: kinsukmanisinha@gmail.com on Wed, 14 October 2015 09:38
		Re: Merging DHS data in Stata By: Bridgette-DHS on Wed, 21 October 2015 13:55
		Re: Merging DHS data in Stata By: mianrashid on Tue, 10 May 2016 10:01
		Re: Merging DHS data in Stata By: owraza on Tue, 10 May 2016 15:24
		Re: Merging DHS data in Stata By: mianrashid on Tue, 10 May 2016 17:04
		Re: Merging DHS data in Stata By: owraza on Tue, 10 May 2016 20:33
		Re: Merging DHS data in Stata By: Bridgette-DHS on Thu, 12 May 2016 09:08
		Re: Merging DHS data in Stata By: mianrashid on Tue, 17 May 2016 13:01
		Re: Merging DHS data in Stata By: Bridgette-DHS on Thu, 19 May 2016 10:14
		Re: Merging DHS data in Stata By: phres110 on Wed, 02 November 2016 13:29
		Re: Merging DHS data in Stata By: Bridgette-DHS on Fri, 11 November 2016 10:27
		Re: Merging DHS data in Stata By: Malachi Arunda on Sat, 16 May 2015 07:39
		Re: Merging DHS data in Stata By: Malachi Arunda on Sat, 16 May 2015 07:46
		Re: Merging DHS data in Stata By: Bridgette-DHS on Tue, 19 May 2015 11:14
		Re: Merging DHS data in SPSS By: Malachi Arunda on Sun, 24 May 2015 08:29
		Re: Merging DHS data in Stata By: Malachi Arunda on Sat, 30 May 2015 13:46
		Re: Merging DHS data in Stata By: Bridgette-DHS on Mon, 01 June 2015 13:00
		Re: Merging DHS data in Stata By: Malachi Arunda on Tue, 09 June 2015 23:21
		Re: Merging DHS data in Stata By: Bridgette-DHS on Wed, 10 June 2015 10:41
		Re: Merging DHS data in Stata By: Malachi Arunda on Tue, 04 August 2015 17:55
		Re: Merging DHS data in Stata By: Bridgette-DHS on Wed, 05 August 2015 10:04
		Re: Merging DHS data in Stata By: Malachi Arunda on Wed, 05 August 2015 13:22
		Re: Merging DHS data in Stata By: Malachi Arunda on Sun, 30 August 2015 06:21
		Re: Merging DHS data in Stata By: Reduced-For(u)m on Sun, 30 August 2015 14:36
		Re: Merging DHS data in Stata By: Reduced-For(u)m on Sun, 30 August 2015 14:37
		Re: Merging DHS data in Stata By: Malachi Arunda on Mon, 31 August 2015 12:27
		Re: Merging DHS data in Stata By: Reduced-For(u)m on Mon, 31 August 2015 15:10
		Re: Merging DHS data in Stata By: Malachi Arunda on Mon, 31 August 2015 15:43
		Re: Merging DHS data in Stata By: PublicHealthMaster on Fri, 11 September 2015 08:45
		Re: Merging DHS data in Stata By: Bridgette-DHS on Wed, 30 September 2015 07:31
		Re: Merging DHS data in Stata By: pie on Tue, 02 June 2020 06:21
		Re: Merging DHS data in Stata By: Bridgette-DHS on Fri, 05 June 2020 15:32

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