# st: AW: How to write a fast code to obtain a specific calculation

 From "Martin Weiss" To Subject st: AW: How to write a fast code to obtain a specific calculation Date Wed, 18 Feb 2009 13:56:45 +0100

```<>

If it is all about speed,

*************
qui summ WT, mean
*************

is the way to go. Contrary to its name, it does leave a few things in its
wake, among them -r(sum)-

HTH
Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Tiago V.
Pereira
Gesendet: Mittwoch, 18. Februar 2009 00:53
An: statalist@hsphsun2.harvard.edu
Betreff: st: How to write a fast code to obtain a specific calculation

Dear statalisters,

I usually  need to compute a value X that satifies a specific condition.

A typical example is shown below. But this is only a single example, and
ordinarily I have similar, but more complex aims.

Hence, I would like to know your expert opinion on how one can make codes
these kind of codes faster. Perhaps only Mata helps?

In this example, I want to compute the value of tau^2 that imposes the
lower limit of my confidence interval to be 0.

.
.
.
scalar lower_limit = 999999999
while lower_limit>0 {
local tau2 = `tau2'+0.0001
cap drop T_i V_i W_i WT
gene T_i= ln(_ES)
gene V_i = _selogES^2
gene W_i = 1/(V_i+`tau2')
gene WT = W_i*T_i
qui summ WT
scalar sum_WT = r(sum)
qui sum W_i
scalar sum_W_i = r(sum)
scalar summary_random = sum_WT/sum_W_i
scalar lower_limit = summary_random-(1.96/sqrt(sum_W_i))
}

Cheers!

Tiago

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