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RE: AW: AW: st: AW: Generating a dropout dummy variable?


From   Ignacio Martinez <ignacio@virginia.edu>
To   statalist@hsphsun2.harvard.edu
Subject   RE: AW: AW: st: AW: Generating a dropout dummy variable?
Date   Sun, 27 Jun 2010 17:55:12 -0400

You are so awesome!!!

I understand the code and is doing what i need it to do.

One final thing. I want to know the total of dropouts in each year. So
what I'm doing is:
sort year
by year: count if dropout==1

Is this ok? Is there a better / more elegant way of doing this?

THANKS!!!!

-Ignacio


On Sun, 2010-06-27 at 23:37 +0200, Martin Weiss wrote:
> <>
> 
> ***********
> //generate an indicator ==1 if is the last time i see the individual
> bys id (year): gen byte lasttime=_n==_N
> 
> //Then i need to create the dropout indicator following the rule that if
> //last year ==1 and graduated!=1 then dropout==1
> gen byte dropout=lasttime & graduated!=1
> ***********
> 
> These two lines could be telescoped into one, but I wanted to show the process more comprehensively. 
> 
> 
> 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 23:13
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: AW: AW: st: AW: Generating a dropout dummy variable?
> 
> Now I think I finally know what I need to do.
> 
> First I need to generate an indicator ==1 if is the last time i see the
> individual (for example for id=1 if the last time i see him is t=2002
> then the indicator ==1 in 2002 and ==0 in the other periods)
> Then i need to create the dropout indicator following the rule that if
> last year ==1 and graduated!=1 then dropout==1
> 
> I think this is going to work, but I'm not sure how to code it. 
> 
> Thanks for the help!!!
> 
> -Ignacio
> 
> 
> On Sun, 2010-06-27 at 20:22 +0200, Martin Weiss wrote:
> > <> 
> > 
> > 
> > "So the code should do something like: when is the first time I see the
> > student. Do I see him after the first time. Was he graduated the last
> > time i saw him."
> > 
> > 
> > 
> > The answers to these questions are quite easily obtained, actually:
> > 
> > 
> > *************
> > //Create data
> > clear*
> > set obs 1000
> > set seed 43550
> > 
> > //id
> > gen int id=_n
> > //random start year
> > gen startyear=1999+irecode(runiform(),0,.2,.5,.7,1)
> > 
> > //expand to # of time periods
> > expand 7
> > 
> > bys id: gen int year=_n-1+startyear
> > gen byte graduated=  /* 
> > */ runiform()<0.3
> > 
> > drop if runiform()<.3
> > 
> > //throw out twice graduated guys
> > bys id: egen mytotal=total(graduated)
> > drop if mytotal>2 & !mi(mytotal)
> > drop mytotal startyear
> > drop if year==2009
> > 
> > xtset id year
> > 
> > 
> > 
> > //So the code should do something like:
> > //when is the first time I see the student?
> > bys id: egen firstyear=min(year)
> > 
> > //Do I see him after the first time?
> > by id: gen byte afterfirsttime=year>firstyear & /* 
> > */ !mi(year)
> > 
> > //Was he graduated the last time I saw him?
> > bys id (year): gen byte gradlasttime=(_n==_N)*graduated
> > 
> > l in 1/21, sepby(id) noo ab(20)
> > *************
> > 
> > 
> > 
> > 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 19:54
> > An: statalist@hsphsun2.harvard.edu
> > Betreff: Re: AW: st: AW: Generating a dropout dummy variable?
> > 
> > Thanks
> > Now i understand better.
> > 
> > I think I explain my self wrong the first time so the code is not doing
> > exactly what I need.
> > 
> > My data goes from 2000 to 2008. So is possible that a student enroll in
> > any year between 2000 and 2008. If I'm understanding the code right I
> > should change the first line to:
> > bys id: egen myvar=total(inlist(year,2000,2008))
> > 
> > Is this right?
> > 
> > But now I'm not sure how should I change the second line.
> > 
> > The problem is that some student were enroll for the first time in 2000
> > some others in 2001, 2002, etc.
> > 
> > So the code should do something like: when is the first time I see the
> > student. Do I see him after the first time. Was he graduated the last
> > time i saw him. Or something like that
> > 
> > Thanks a lot for your help.
> > 
> > -Ignacio
> > 
> > 
> > On Sun, 2010-06-27 at 19:38 +0200, Martin Weiss wrote:
> > > <> 
> > > 
> > > " About your code... I'm kind of lost on how you create the dropout
> > > indicator. Could you explain a little that piece of code?"
> > > 
> > > 
> > > 
> > > 
> > > 
> > > *************
> > > //get "dropout" indicator
> > > 
> > > //Do I see "id" in 2000 and 2001?
> > > bys id: egen myvar=total(inlist(year,2000,2001))
> > > 
> > > //How many times did I see "id" between 2002 and 2006?
> > > bys id: egen myvar2=total(inrange(year,2002,2006))
> > > 
> > > //dropout is 1 if I saw "id" in 2000 and 2001
> > > //and did not see him again afterwards
> > > //and, in 2001, his "graduated" was not 1
> > > bys id: gen dropout=((myvar==2)*(myvar2==0))& /* 
> > > */ ((graduated!=1)*(year==2001))
> > > *************
> > > 
> > > 
> > > See this thread for the tricks re "conditions": http://www.stata.com/statalist/archive/2010-06/msg00985.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 19:33
> > > An: statalist@hsphsun2.harvard.edu
> > > Betreff: Re: st: AW: Generating a dropout dummy variable?
> > > 
> > > About the second part:
> > > What I was trying to say is that if i see a student in the year 2000 and
> > > i don't see him in 2001 because he is taking a break but in the year
> > > 2005 he is back in my sample I don't want to mark him as drop out but I
> > > want to generate a variable that says that he took a 4 year break.
> > > 
> > > About your code... I'm kind of lost on how you create the dropout
> > > indicator. Could you explain a little that piece of code?
> > > 
> > > Thanks a lot
> > > 
> > > -Ignacio
> > > 
> > > 
> > > On Sun, 2010-06-27 at 19:01 +0200, Martin Weiss wrote:
> > > > <> 
> > > > 
> > > > The first part could be:
> > > > 
> > > > 
> > > > *************
> > > > 
> > > > //Create data
> > > > clear*
> > > > set obs 1000
> > > > set seed 43550
> > > > 
> > > > //id
> > > > gen int id=_n
> > > > 
> > > > //expand to # of time periods
> > > > expand 7
> > > > 
> > > > bys id: gen int year=_n+1999
> > > > gen byte graduated=  /* 
> > > > */ cond(runiform()<0.3 & year==2001,1,0) 
> > > > 
> > > > drop if runiform()<.7
> > > > 
> > > > xtset id year
> > > > 
> > > > //get "dropout" indicator
> > > > bys id: egen myvar=total(inlist(year,2000,2001))
> > > > bys id: egen myvar2=total(inrange(year,2002,2006))
> > > > bys id: gen dropout=((myvar==2)*(myvar2==0))& /* 
> > > > */ ((graduated!=1)*(year==2001))
> > > > drop myvar*
> > > > 
> > > > //take a look
> > > > bys id: egen anydropout=max(dropout)
> > > > l if anydropout, sepby(id)
> > > > *************
> > > > 
> > > > 
> > > > I do not understand the second part. Why would dropout be 1 in 2000 if you saw the guy in 2000?
> > > > 
> > > > 
> > > > 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 15:54
> > > > An: statalist@hsphsun2.harvard.edu
> > > > Betreff: st: Generating a dropout dummy variable?
> > > > 
> > > > Hi,
> > > > 
> > > > 
> > > > My panel has the following variables: Year (from 2000 to 2008), ID,
> > > > Graduated (an indicator =1 if the student graduated that year) . 
> > > > 
> > > > I want to generate a dropout variable. If I see ID==1111 in year==2000
> > > > and 2001 but not after that and graduated !=1 in 2001 I want dropout==1
> > > > in 2001 . The only other detail is that if a see someone in 2000 and
> > > > then I see him again in 2006 with graduated=1 I don't want dropout =1 in
> > > > 2000 I want other variable that is break=5 (that student took 5 year of
> > > > break)
> > > > 
> > > > 
> > > > Thanks for the help
> > > > 
> > > > 
> > > > -Ignacio
> > > > 
> > > > 
> > > > *
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