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POStata: Appending multiple files and extracting variables from file names
 

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  1. POStata: Appending multiple files and extracting variables from file names
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    <p>I have 114 files with .dat extension to convert to Stata/SE and append, with substantial number of variables (varying from 81 to 16800). I have reset max number of variables to 32000 (<code>set maxvar 32000</code>), increased the memory (<code>set mem 500m</code>) and I was using the following algorithm to combine large number of files and to generate several variables by extracting parts of file names: <a href="http://www.ats.ucla.edu/stat/stata/faq/append_many_files.htm" rel="nofollow">http://www.ats.ucla.edu/stat/stata/faq/append_many_files.htm</a></p> <p>The code looks as follows:</p> <pre><code>cd "C:\Users\..." ! dir *.dat /a-d /b &gt;d:\Stata_directory\Products_batchfilelist.txt file open myfile using "d:\Stata_directory\Products_batchfilelist.txt", read file read myfile line drop _all insheet using `line', comma names gen n = substr("`line'",10,1) gen m = substr("`line'",12,1) gen playersnum = substr("`line'",14,1) save Products_merged.dta, replace drop _all file read myfile line while r(eof)==0 { insheet using `line', comma names gen n = substr("`line'",10,1) gen m = substr("`line'",12,1) generate playersnum = substr("`line'",14,1) save `line'.dta, replace append using Products_merged.dta save Products_merged.dta,replace drop _all file read myfile line } </code></pre> <p>The problem is that although variables <code>n,m,playersnum</code>extracted from file names are present in each individual file, they disappear in the final "Products_merged.dta" file. Could anyone tell me what could be the problem and if it is possible to solve with Stata/SE?</p>
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