# st: Re: RE: How to solve a problem with globals

 From "Martin Weiss" To Subject st: Re: RE: How to solve a problem with globals Date Tue, 24 Feb 2009 22:58:55 +0100

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We can play all kinds of games with this thing, but really Tiago, have you been bitten by this or are you just trying things out?
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HTH
Martin
_______________________
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----- Original Message ----- From: "Kieran McCaul" <kamccaul@meddent.uwa.edu.au>
```To: <statalist@hsphsun2.harvard.edu>
Sent: Tuesday, February 24, 2009 10:51 PM
Subject: st: RE: How to solve a problem with globals

```
```What if you define the -local- first, does that help?

. local i = 1

. global f_pA_`i' = 0.5

. dis \$f_pA_1
.5

______________________________________________
Kieran McCaul MPH PhD
WA Centre for Health & Ageing (M573)
University of Western Australia
Level 6, Ainslie House
48 Murray St
Perth 6000
Phone: (08) 9224-2140
Fax: (08) 9224 8009
email: kamccaul@meddent.uwa.edu.au
http://myprofile.cos.com/mccaul
http://www.researcherid.com/rid/B-8751-2008
______________________________________________
The fact that no one understands you doesn't make you an artist.

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Tiago V.
Pereira
Sent: Wednesday, 25 February 2009 3:51 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: How to solve a problem with globals

Dear statalisters,

Firstly, I would like to thank several statalisters for the splendid
help
in my previous questions.

Now, I am having the following problem:

. global f_pA_1 = 0.5

. local i = 1

. dis \$f_pA_`i'
1

. dis \$f_pA_1
.5

Is that normal?

All the best,

Tiago

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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