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Re: st: RE: Use a few observations from a tab-delimited or csv file


From   "Sergiy Radyakin" <serjradyakin@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Use a few observations from a tab-delimited or csv file
Date   Wed, 20 Aug 2008 11:19:42 -0400

Hello Martin

unless you have Excel 2007 (or newer :) , the file limit is 65535x256,
while in Todd's case the file is 80000x2200, so Excel would have a
hard time.

Regards, Sergiy



On 8/20/08, Martin Weiss <martin.weiss@uni-tuebingen.de> wrote:
> Well, to  create a dataset of summary datasets, use -h collapse-. If you had
> access to Stat/Transfer, that would facilitate your problem with the size of
> the file. Excel could probably take care of the conversion as well, but is
> usually frowned upon on the list...
>
> HTH
> Martin
>
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Todd D. Kendall
> Sent: Wednesday, August 20, 2008 4:41 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: Use a few observations from a tab-delimited or csv file
>
> Dear Statlisters,
>
> I have a file that is currently in csv format (or I could easily
> convert it to tab-delimited).  It is fairly large: roughly 80,000
> observations and 2,200 variables.
>
> In fact, it is too large to fit into Stata (I am running Stata 9.2 on
> a Windows XP machine with 1 GB of RAM).  The maximum memory I can
> allocate to Stata is -set mem 636m-.  When I try to simply insheet the
> file at this setting, I get only 16,276 observations read in -- not
> anywhere close to the whole file, so I don't think there are any easy
> tweaks to make this work.
>
> However, it turns out that, for roughly the last 2,000 variables, I
> really don't need every single variable; instead, I just need a few
> summary statistics calculated over these 2,000 variables (e.g., the
> mean or standard deviation).  My idea is to write a simple do file
> that loads in, say, the first 15,000 observations, computes the mean
> and standard deviation of the 2,000 variables, then drops these
> variabes and saves as a .dta file.  I would then repeat on the next
> 15,000 observations, and so on.  Then I could just append all the
> little files together, and I would assume I could fit this into Stata,
> as it would only have around 200 variables instead of 2,200.
>
> My problem is that insheet doesn't work with "in" -- i.e., I can't
> write -insheet filename.csv in 1/15000-.  Alternatively, if I could
> convert the file from csv into a fixed format, I could write a
> dictionary and use infix, but my Google search for how to convert a
> csv file into a fixed-column file has come up pretty dry.
>
> Am I barking up the wrong tree completely here, or am I missing
> something obvious?  I greatly appreciate any suggestions.
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