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Re: st: A question on programming


From   "Quang Nguyen" <quangn@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: A question on programming
Date   Wed, 21 Feb 2007 22:18:53 -1000

Dear all,

There are some typos in the last email. I would like to repost it here:

Thanks to suggestions by members of Statalist, I developed the
following program:

program define sol
 if "`1'" == "?" { /* if query call ... */
 global S_1 "A B" /* identify parameters */
 global X = 0.5 /* and initialize */
                      /* them */
      exit
 }
 /* otherwise, calculate function */

 replace `1' = a * exp($X) - b * ($X)^2
set obs 1
gen y=1
nl sol y

end

This program aims at solving the equation: a*exp(X)=b*(X^2). Where a,
and b come from the following data set:

id        a          b
1         3          5
2         7          9
3         4          7

and so on.

My question is how I can integrate these values of a, and b into the
above program so that the value of X for each individual (ID=1, 2, 3
etc.,) can be solved automatically.

Thanks so much for your help!
Have A Wonderful Day!


On 2/21/07, Quang Nguyen <quangn@gmail.com> wrote:
Dear all,

Thanks to suggestions by members of Statalist, I developed th
efollowing program:

program define sol
  if "`1'" == "?" { /* if query call ... */
  global S_1 "A B" /* identify parameters */
  global A = 0.5 /* and initialize */
  global B = 0.5 /* them */
       exit
  }
  /* otherwise, calculate function */

  replace `1' = a * exp($X) - b * ($X)^2
set obs 1
gen y=1
nl sol y

end

This program aims at solving the equation: a*exp(X)=b*(X^2). Where a,
and b comes from the following data set:

id        a          b
1         3          5
2         7          9
3         4          7

and so on.

My question is how I can integrate these values of a, and b into the
above program so that the value of X for each individual (ID=1, 2, 3
etc.,) can be solved automatically.

Thanks so much for your help!
Have A Wonderful Day!
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