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Re: st: RE: Append multiple files from .txt file with "file read"


From   Nicole Boyle <nicboyle@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Append multiple files from .txt file with "file read"
Date   Thu, 5 Dec 2013 16:36:52 -0800

Hi David,

Thanks for your reply. Your rather elegant solution worked perfectly
for appending the datasets. However, the resulting data are not
matched 1:1 on ID, an issue which is my fault: It seems that I
incorrectly chose -append- for adding data horizontally on a 1:1 ID
match when -merge- is probably the better solution.

Looking at the help files, -merge- doesn't seem to be able to handle
multiple files like -append- can. Nor can -append- match 1:1 like
-merge- can. (Please correct me if I'm wrong)

Is there a similar solution to the one you presented, but with -merge-?

Nicole


On Thu, Dec 5, 2013 at 3:52 PM, Radwin, David <dradwin@rti.org> wrote:
> Nicole,
>
> The -append- command lets you add multiple files at once without the
> need for loops, ancillary text files, etc. Why not just make a local
> macro of all the Stata files in your directory and then -append- them
> all at once?
>
>
> local f : dir . files "*.dta"
> display as result `"`f'"'
> append using `f'
>
>
> David
> --
> David Radwin, Senior Research Associate
> Education and Workforce Development
> RTI International
> 2150 Shattuck Ave. Suite 800, Berkeley, CA 94704
> Phone: 510-665-8274
>
> www.rti.org/education
>
>
>> -----Original Message-----
>> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-
>> statalist@hsphsun2.harvard.edu] On Behalf Of Nicole Boyle
>> Sent: Thursday, December 05, 2013 3:30 PM
>> To: statalist@hsphsun2.harvard.edu
>> Subject: st: Append multiple files from .txt file with "file read"
>>
>> Hello all,
>>
>> First and foremost, I have yet to fully understand how to use macros,
>> so please forgive me if the solution to this problem is painfully
>> obvious. I actually hope it's painfully obvious.
>>
>> I'm trying to combine multiple .dta files (1:1 horizontally appended)
>> by calling several .dta filenames stored in a .txt file. However, in
>> the process of doing this, whenever I try to run:
>>
>> .    use `line'
>>
>> Stata returns the error:
>>
>> .    invalid file specification
>>
>>
>> Here's the code I'm trying to execute (sourced from here*). To start,
>> I'm trying to execute this code on a .txt file containing just two
>> lines (aka: two .dta filenames), but the final file will have 25
>> lines:
>>
>>    pwd
>>    cd ~/Desktop/merge
>>    ! ls *.dta >filelist.txt
>>    file open myfile using "filelist.txt", read
>>    file read myfile line
>>    use `line'  /* ERROR HERE */
>>    save master_data, replace
>>    file read myfile line
>>    while r(eof)==0 {
>>    append using `line'
>>    file read myfile line
>>    }
>>    file close myfile
>>    save master_data, replace
>>
>>
>> I first thought the problem was that "filelist.txt" wasn't being read.
>> However, I believe it IS being read, since running the following:
>>
>>    ! ls *.dta >filelist.txt
>>    file open myfile using "filelist.txt", read
>>    file read myfile line
>>    while r(eof)==0 {
>>    display "`=word("`line'",1)'"
>>     file read myfile line
>>     }
>>
>> only displays the second (but not the first) line of the two-line .txt
>> file.
>>
>> Perhaps my issue has something to do with Stata overlooking the first
>> line of the .txt file? Or perhaps my general macro-incompetence (more
>> likely)?
>>
>> Any help will be greatly appreciated. Thanks so much for your
>> consideration.
>>
>> Nicole
>>
>>
>> *Code from
> http://www.ats.ucla.edu/stat/stata/faq/append_many_files.htm
>
>
> *
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