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From |
"Todd D. Kendall" <todddavidkendall@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Use a few observations from a tab-delimited or csv file |

Date |
Wed, 20 Aug 2008 09:40:33 -0500 |

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. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Use a few observations from a tab-delimited or csv file***From:*"Michael Blasnik" <michael.blasnik@gmail.com>

**Re: st: Use a few observations from a tab-delimited or csv file***From:*"Sergiy Radyakin" <serjradyakin@gmail.com>

**Re: st: Use a few observations from a tab-delimited or csv file***From:*Maarten buis <maartenbuis@yahoo.co.uk>

**st: RE: Use a few observations from a tab-delimited or csv file***From:*"Martin Weiss" <martin.weiss@uni-tuebingen.de>

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