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Re: st: RE: Modify large data base without opening it


From   "José Luis Chávez Calva" <josechc@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Modify large data base without opening it
Date   Wed, 24 Sep 2008 16:24:25 -0500

Thanks again for your help.
Regards,
José Luis


2008/9/24 Martin Weiss <martin.weiss1@gmx.de>:
> Been there myself:
> http://www.stata.com/statalist/archive/2008-04/msg01278.html
>
> -drop-ping probably requires the data to be held in memory, so unless you
> can open the dataset... Still, my initial post remains valid: -use- whatever
> you want to -keep- in terms of variables, and -save- under a different name
> and you have effectively -drop-ped, right?
>
> HTH
> Martin
>
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of José Luis Chávez
> Calva
> Sent: Wednesday, September 24, 2008 11:10 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: RE: Modify large data base without opening it
>
> Thanks for the quick response. I apologize for not making myself
> clear: I want to drop the variables because I'm trying to clean the
> data set. That's why I would like to know if there is a command to
> drop them without opening the data set.
> Thanks again,
> José Luis
>
> 2008/9/24 Michael I. Lichter <mlichter@buffalo.edu>:
>> Martin is of course right and I apologize for misreading the question. I
> was
>> thinking about my own problems with reading large datasets not yet in
> Stata
>> format.
>>
>> -ml
>>
>> Martin Weiss wrote:
>>>
>>> No need to drop anything, just load whatever you need with -use with
>>> options-. See - h use-
>>>
>>>
>>> HTH
>>> Martin
>>>
>>>
>>> -----Original Message-----
>>> From: owner-statalist@hsphsun2.harvard.edu
>>> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of José Luis
>>> Chávez
>>> Calva
>>> Sent: Wednesday, September 24, 2008 10:18 PM
>>> To: statalist@hsphsun2.harvard.edu
>>> Subject: st: Modify large data base without opening it
>>>
>>> I'm working with a very large data base (1000m, 2000 vars) and my PC
>>> is taking too long to open it. I would like to know if there is a way
>>> or a specific command to drop some variables without actually opening
>>> the data base.
>>>
>>> Thanks in advance,
>>>
>>> José Luis Chávez Calva
>>>
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>>
>> --
>> Michael I. Lichter, Ph.D.
>> Research Assistant Professor & NRSA Fellow
>> UB Department of Family Medicine / Primary Care Research Institute
>> UB Clinical Center, 462 Grider Street, Buffalo, NY 14215
>> Office: CC 125 / Phone: 716-898-4751 / E-Mail: mlichter@buffalo.edu
>>
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