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From | "Martin Weiss" <martin.weiss1@gmx.de> |
To | <statalist@hsphsun2.harvard.edu> |
Subject | RE: st: How to count switches ? |
Date | Sun, 27 Jun 2010 00:38:23 +0200 |
<> So -ssc d tsspell- is user-written by Nick Cox. Try a simple example, and the meaning becomes clear. Everytime your variable changes, _spell is stepped up. So its maximum should be what you want: *********** clear* set obs 25 set seed 12543 gen byte time=_n gen byte myvar=runiform()<.7 tsset time tsspell myvar l, noo sepby(_spell) su _spell, mean di in r "# of spells: " r(max) *********** BTW, no attachments on Statalist... HTH Martin -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Ignacio Martinez Sent: Sonntag, 27. Juni 2010 00:26 To: statalist@hsphsun2.harvard.edu Subject: Re: st: How to count switches ? Thanks a lot for the help. I need a little more help. I installed tsspell. When I do "tsspell status" it generates 3 new variables _spell, _seq, _end . I'm confuse about how can i get the total number of switches in my data set by using those variables. Best, -Ignacio On Sat, 2010-06-26 at 15:25 -0400, Dmitriy Krichevskiy wrote: > There is -tsspell- that does this. (-findit tsspell-). > > On 6/26/10, Ignacio Martinez <ignacio@virginia.edu> wrote: > > Hi I'm new in the list and I hope someone can help me. > > > > I would like to know how can I count switches in stata. I have the > > following variables: Year, ID, Employment status > > I want to generate a variable that ==1 if employment status in year t != > > to employment status in year t-1 for each individual. > > > > Thanks a lot for the help. > > > > -Ignacio > > > > * * 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/