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Re: st: RE: RE: generating a variable?


From   Ignacio Martinez <ignacio@virginia.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: RE: generating a variable?
Date   Thu, 28 Jul 2011 17:40:41 -0400

Thanks Sarah

On Thu, Jul 28, 2011 at 4:41 PM, Sarah Edgington <sedging@ucla.edu> wrote:
> .
> Your example code, in addition to being nonsense in terms of syntax, also
> uses illegal variable names.  Moreover, the name and number of variables
> differs from what you describe having in the data.  My suggested solution
> ignores your example code and is based solely on your description of the
> data.  If your description doesn't accurately reflect what you're working
> with then my suggestion may not help much.
>
> Here's one way to get the four year total:
>
> gen
> total_4_year=(E01==3)+(E02==3)+(E03==3)+(E04==3)+(E05==3)+(E06==3)+(E07==3)+
> (E08==3)+(E09==3)+(E10==3)+(E11==3)+(E12==3)
>
>
> -Sarah
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> Sent: Thursday, July 28, 2011 12:24 PM
> To: 'statalist@hsphsun2.harvard.edu'
> Subject: st: RE: generating a variable?
>
> I am very surprised that you imply that this even works at all. "then" is
> just fantasy code so far as Stata is concerned. Alternatively, if this is a
> mix of Stata and pseudocode, then please show us the real Stata code.
>
> See also
>
> FAQ     . . . . . . . . . . . . . . . . . . . . .  if command vs. if
> qualifier
>        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  J.
> Wernow
>        6/00    I have an if or while command in my program that
>                only seems to evaluate the first observation,
>                what's going on?
>                http://www.stata.com/support/faqs/lang/ifqualifier.html
>
> to learn that -if- as you (intend to) use it is not what you want.
>
> Nick
> n.j.cox@durham.ac.uk
>
> Ignacio,  Martinez
>
> I'm having troubles generating 2 new variables with my data.
>
> I have the following variables: ID; E01-E12 where E01 =3 indicates that i is
> enrolled in a 4 year college in January, and E05=2 means that he is enrolled
> in a 2 year college in may.
>
> I want to generate a 2 new variables Total_2_year that is the total number
> of month that i is enrolled in a 2 year college and total_4_year that is the
> total number of month that i is enrolled in a
> 4 year college.
>
> What is the best way of doing this?
>
> My first attempt was this
> <code>
> *Generates vectors of total months enrolled in college gen total_2_year = 0
> gen total_4_year = 0 gen total_none = 0
>
>
> forvalues month=1/9 {
>                if 511200`month'==3 then total_4_year==total_4_year+1
>                if 511200`month'==2 then total_2_year==total_2_year+1
>                if 511200`month'==1 then total_none==total_none+1
>                if 511200`month'==-4 then total_none==-4
>                if 511200`month'==-4 then total_2_year==-4
>                if 511200`month'==-4 then total_4_year==-4
>
>        }
>
> </code>
>
> but i get only zeros... :_(
>
>
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