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Re: st: Programming advice on specifying a sample-specific default value


From   "Le Wang" <statauser@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Programming advice on specifying a sample-specific default value
Date   Tue, 1 Apr 2008 01:23:16 -0500

Paul,

Many thanks. I appreciate this. It works well!

Le

On Tue, Apr 1, 2008 at 1:09 AM, Paul Millar <paul.millar@shaw.ca> wrote:
> Hi Le,
>
>  Try this:
>
>  program example
>  version 10
>  syntax varlist(max=2) [if] [in] [, option1(numlist max=1)]
>
> gettoken y 0: 0
>  gettoken x 0: 0
>  if "`option1'" == "" {
>    local option1=sum(y)/sum(x)
>  }
>  di "option1=`option1'"
>  end
>
>  example x y
>  example x y, option1(44)
>
>  - Paul
>
>
>
>  At 01:28 AM 01/04/2008, you wrote:
>  >Thanks Paul.
>  >
>  >I thought about using some arbitrarily large number earlier. But I
>  >recently came across an example, in which case the specified value is
>  >indeed that large..So, I was wondering if there is any better
>  >alternative.
>  >
>  >Le
>  >
>  >On Tue, Apr 1, 2008 at 12:12 AM, Paul Millar <paul.millar@shaw.ca> wrote:
>  > > How about something like:
>  > >
>  > >  program define example,rclass
>  > >         syntax varlist(max=2) [if] [in] [, option1(real -999)]
>  > >
>  > >         gettoken y 0: 0
>  > >         gettoken x 0: 0
>  > >
>  > >         if `option1' == -999 {
>  > >
>  > >                local option1=sum(y)/sum(x)
>  > >         }
>  > >
>  > >
>  > >
>  > > At 12:01 AM 01/04/2008, you wrote:
>  > >  >Hi there,
>  > >  >
>  > >  >Thanks in advance for your time.
>  > >  >
>  > >  >I am programming a ado file which needs to calculate a sample-specific
>  > >  >default value (according to some formulae), when the user does not
>  > >  >specify the option. I am not quite sure how I should use the -syntax-
>  > >  >to do this because -syntax- requires a fixed default value.
>  > >  >
>  > >  >For example, - example - won't work.
>  > >  >
>  > >  >program define example,rclass
>  > >  >        syntax varlist(max=2) [if] [in] [, option1(real)]
>  > >  >        gettoken y 0: 0
>  > >  >        gettoken x 0: 0
>  > >  >
>  > >  >        if "`option1'" == ""{
>  > >  >               local option1=sum(y)/sum(x)
>  > >  >        }
>  > >  >end
>  > >  >
>  > >  >But how can I get around with this? Thank you very much.
>  > >  >
>  > >  >Le
>  > >  >--
>  > >  >~~~~~~~~~~~~~~~~~~~~~~~~~~~
>  > >  >Le Wang, Ph.D.
>  > >  >Minnesota Population Center
>  > >  >University of Minnesota
>  > >  >(o) 612-624-5818
>  > >  >*
>  > >  >*   For searches and help try:
>  > >  >*   http://www.stata.com/support/faqs/res/findit.html
>  > >  >*   http://www.stata.com/support/statalist/faq
>  > >  >*   http://www.ats.ucla.edu/stat/stata/
>  > >
>  > >  *
>  > >  *   For searches and help try:
>  > >  *   http://www.stata.com/support/faqs/res/findit.html
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>  > >  *   http://www.ats.ucla.edu/stat/stata/
>  > >
>  >
>  >
>  >
>  >--
>  >~~~~~~~~~~~~~~~~~~~~~~~~~~~
>  >Le Wang, Ph.D.
>  >Minnesota Population Center
>  >University of Minnesota
>  >(o) 612-624-5818
>  >*
>  >*   For searches and help try:
>  >*   http://www.stata.com/support/faqs/res/findit.html
>  >*   http://www.stata.com/support/statalist/faq
>  >*   http://www.ats.ucla.edu/stat/stata/
>
>  *
>  *   For searches and help try:
>  *   http://www.stata.com/support/faqs/res/findit.html
>  *   http://www.stata.com/support/statalist/faq
>  *   http://www.ats.ucla.edu/stat/stata/
>



-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Le Wang, Ph.D.
Minnesota Population Center
University of Minnesota
(o) 612-624-5818
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



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