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From | Nick Cox <njcoxstata@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: Generating new variables with values of difference in 2 variables |
Date | Wed, 18 Apr 2012 17:06:32 +0100 |
forval j = 1/7 { local J = `j' + 1 gen var`j' = day`J' - day`j' } or forval j = 1/7 { gen var`j' = day`=`j' + 1' - day`j' } All that said, this sounds a very bad idea strategically. Presumably -day1- is what happens on day 1, and so forth, so this is time series or panel data. You start out with 8 day variables, then add 7 difference variables. When this is going to stop as you add further analyses? Better to -reshape long-. Then you can work with one response variable, one set of differences, etc. Nick On Wed, Apr 18, 2012 at 4:59 PM, Hitesh Chandwani <hchandwani.stata@gmail.com> wrote: > This is another query about loops. I have 8 variables day1-day8. I am > trying to run a loop that does: > > gen var1=day2-day1 > gen var2=day3-day2 > gen var3=day4-day3...and so on. > > From previous statlist emails, I found how to run loops subtracting > one series of variables from another > (http://www.stata.com/statalist/archive/2012-01/msg00303.html), but > I'm having a hard time trying to generate a loop where variables > within the same series are subtracted from each other. * * 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/