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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
AW: st: How to count switches ? |

Date |
Sun, 27 Jun 2010 13:56:02 +0200 |

<> " When I do "expand 2, gen(id)" I get the error "option gen() not allowed" (I'm have stata 10)." Sorry about that! Indeed -expand- lacked the -gen()- option back then, but you can replicate its effect: ************* vers 10 clear* set obs 25 gen byte time=_n expand 2 gen byte id=(_n>`=_N/2')+1 gen byte myvar=runiform()<.7 tsset id time tsspell myvar l, noo sepby(id) h(25) bys id: gen byte tag=_n==_N egen mytotal=total(tag*_spell) di in r "Overall # of spells: " mytotal[_N] ************* " Another tiny question. I have half a millon observation over 10 years. I would like to know how many individuals i have in my data, that is how many unique id . How do i do that?" Add this to the end of the code: ************* egen mygroups=group(id) su mygroups, mean di in r "I have `r(max)' groups in my data" ************* Also see NJC and coauthor`s http://www.stata.com/support/faqs/data/distinct.html HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Ignacio Martinez Gesendet: Sonntag, 27. Juni 2010 13:39 An: statalist@hsphsun2.harvard.edu Betreff: RE: st: How to count switches ? I'm almost there :-). In your example I'm having a tiny problem. When I do "expand 2, gen(id)" I get the error "option gen() not allowed" (I'm have stata 10). Another tiny question. I have half a millon observation over 10 years. I would like to know how many individuals i have in my data, that is how many unique id . How do i do that? Thanks. -Ignacio On Sun, 2010-06-27 at 11:33 +0200, Martin Weiss wrote: > <> > > With a panelvar present, -ssc d tsspell- reports the _spell variable as within the panelvar. I have added two lines at the end to let you report the overall number: > > *********** > clear* > set obs 25 > gen byte time=_n > expand 2, gen(id) > gen byte myvar=runiform()<.7 > tsset id time > tsspell myvar > l, noo sepby(id) > > bys id: gen byte tag=_n==_N > egen mytotal=total(tag*_spell) > > di in r "Overall # of spells: " mytotal[_N] > *********** > > > 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 01:06 > To: statalist@hsphsun2.harvard.edu > Subject: RE: st: How to count switches ? > > Thanks!! > Now I understand much better what is going on. Only one more question. > > Your example is for only one individual. I have a panel and what I want > is the sum of the switches across individuals. So if individual A switch > between employed and unemployed 2 times and individual B switch 3 times > I want to get 5 as my result. How do you do that? If i do > > > su _spell, mean > > di in r "# of spells: " r(max) > > I get 3 instead of 5 :-( . > > > Thanks for helping me. > > -Ignacio > > > On Sun, 2010-06-27 at 00:38 +0200, Martin Weiss wrote: > > <> > > > > 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/ > > > * > * 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/ > > > * > * 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/ * * 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/ * * 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: AW: st: How to count switches ?***From:*Ignacio Martinez <ignacio@virginia.edu>

**References**:**st: How to count switches ?***From:*Ignacio Martinez <ignacio@virginia.edu>

**Re: st: How to count switches ?***From:*Dmitriy Krichevskiy <krichevskyd@gmail.com>

**Re: st: How to count switches ?***From:*Ignacio Martinez <ignacio@virginia.edu>

**RE: st: How to count switches ?***From:*"Martin Weiss" <martin.weiss1@gmx.de>

**RE: st: How to count switches ?***From:*Ignacio Martinez <ignacio@virginia.edu>

**RE: st: How to count switches ?***From:*"Martin Weiss" <martin.weiss1@gmx.de>

**RE: st: How to count switches ?***From:*Ignacio Martinez <ignacio@virginia.edu>

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