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Re: st: extracting of data


From   Jeph Herrin <stata@spandrel.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: extracting of data
Date   Tue, 22 Jan 2013 13:19:19 -0500

Do you have 9 different .dct files for each level? Then maybe you intend something like this:

 clear
 set more off
 set mem 500m
 tempfile mydata
 forv l=1/9 {
    save `mydata', emptyok
    forv d=1/9 {
 	infile using D:\TEAM_PC\level`l'\level`d'.dct, clear
 	capture append using `mydata'
 	save `mydata', replace
	}
    keep if level==`l'
    save "D:\TEAM_PC\level`l'_list.dta", replace
 }

hth,
Jeph

On 1/21/2013 1:15 PM, Prakash Singh wrote:
Nick
Though I managed to write the code and run it but I realised today
that for each level stata is extracting data from only one txt file.
which means that only one dct file is being read.

here is the revised code

clear
set more off
set mem 500m
tempfile mydata
forv l=1/9 {
	infile using D:\TEAM_PC\level`l'\level`l'.dct, clear
	capture append using `mydata'
	save `mydata', replace
	keep if level==`l'
	save "D:\TEAM_PC\level`l'_list.dta", replace
}


Regards
Prakash

On Tue, Jan 1, 2013 at 9:32 PM, Prakash Singh <prakashbhu@gmail.com> wrote:
Thanks Nick
I got it finally

Best wishes to all stata listers for 2013

Regards
Prakash

On Mon, Dec 31, 2012 at 11:10 PM, Nick Cox <njcoxstata@gmail.com> wrote:
I don't understand what is holding you up. Your code shows that you
are familiar with -foreach- and -forval-. So you need to write another
big loop using that construct.

Nick

On Mon, Dec 31, 2012 at 4:37 PM, Prakash Singh <prakashbhu@gmail.com> wrote:
Nick, I thanked you for that

I mentioned in the first mail that the structure of the data is such
that to have final data I need to extract 9 (using 9 dct file for each
level) different level files then some of them I need to reshape and
then merge them.


Hope, I have made my query more clear to you.

regards
Prakash
On Mon, Dec 31, 2012 at 9:48 PM, Nick Cox <njcoxstata@gmail.com> wrote:
You don't comment on my replacement of 9 lines of code with 1.

Your main loop looks like another -forval- or -foreach- loop but you
don't explain why you want to save different levels in different
datasets.

Nick

On Mon, Dec 31, 2012 at 2:27 PM, Prakash Singh <prakashbhu@gmail.com> wrote:
Nick sorry but that is type error.
Thanks for the suggestion anyway.

Moreover I am looking some help on creating look so that I can repeat
the following code for each level 1 to 9.

clear
set more off
set mem 500m
tempfile mydata
foreach l of numlist 11/19 {
    infile using D:\TEAM_PC\level`l'.dct, clear
    capture append using `mydata'
     save `mydata', replace
}
use `mydata', clear
keep if level==1
save level1_list.dta", replace
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