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


From   Paul Millar <paul.millar@shaw.ca>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Programming advice on specifying a sample-specific default value
Date   Tue, 01 Apr 2008 02:09:29 -0400

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
>  >*
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>
>  *
>  *   For searches and help try:
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>



--
~~~~~~~~~~~~~~~~~~~~~~~~~~~
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/



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