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RE: st: Collecting ttest results using parmby, factext, metaparm


From   Tim Evans <Tim.Evans@wmciu.nhs.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Collecting ttest results using parmby, factext, metaparm
Date   Wed, 14 Sep 2011 09:58:09 +0100

I tried pasting this in and changing the version, but I do not get any output at the finish - i.e. a graph - I tried the -eclplot- example in the help page and it works ok:

**BEGIN EXAMPLE**

#delim
version 11.2
 sysuse auto, clear
 global tflist ""
 global modseq=0
 tempfile temp1
 descsave foreign, do(`"`temp1'"', replace)
 foreach X of var weight length {
 local Xlab: var lab `X'
 global modseq=$modseq+1
 tempfile tf$modseq
 ttest `X', by(foreign)
 parmby "regress `X' ibn.foreign, noconst",
 format(estimate min* max* %8.2f p %-8.2g) idstr("`Xlab'")
 saving(`"`tf$modseq'"',replace) flist(tflist)
 }
 clear
 append using $tflist
 sencode idstr, gene(outcome)
 lab var outcome "Outcome"
 fvregen, do(`"`temp1'"')
 drop idstr
 keyby outcome foreign
 desc
 list, abbr(32) noobs sepby(outcome)
 metaparm [iwei=!foreign-foreign], dfcombine(constant) by(outcome) norestore
 list, abbr(32) sepby(outcome)
 eclplot estimate min* max* outcome, hori
  estopts(msize(4)) ciopts(msize(5))
  yscale(range(0 3)) ylab(1 2) xline(0) xtitle("Difference (95% CI)")

**END EXAMPLE


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Roger Newson
Sent: 14 September 2011 09:50
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Collecting ttest results using parmby, factext, metaparm

Yes, the example with CI plots works if converted to Stata 11.2, or even 
to Stata 11.0 (the version in which factor varlists were introduced). 
With Stata 10 or below, you have to use -xi:- and -factext-.

Best wishes

Roger


Roger B Newson BSc MSc DPhil
Lecturer in Medical Statistics
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute
Imperial College London
Royal Brompton Campus
Room 33, Emmanuel Kaye Building
1B Manresa Road
London SW3 6LR
UNITED KINGDOM
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322
Email: r.newson@imperial.ac.uk
Web page: http://www.imperial.ac.uk/nhli/r.newson/
Departmental Web page:
http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgenetics/reph/

Opinions expressed are those of the author, not of the institution.

On 14/09/2011 09:37, Tim Evans wrote:
> Dear Roger,
>
> Does the example with CI plots paste easily into Stata 11.2?
>
> Best wishes
> Tim
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of David Scharff
> Sent: 14 September 2011 09:12
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: Collecting ttest results using parmby, factext, metaparm
>
> Dear Roger
>
> Many, many thanks for your support! Your code works like a charm, and
> is exactly what I needed.
> There have been some earlier queries regarding the
> ttest-parmby-metaparm task and I think you provided us with a perfect
> solution.
> I can now Eclplot all my test results with p-values as labels, great!
> Again, thank you for your help!
> Best wishes
> David
>
> 2011/9/13 Roger Newson<r.newson@imperial.ac.uk>:
>> PS a version of David's -auto- program which also produces CI plots for the
>> differences between US and non-US cars is as follows:
>>
>> **** BEGINNING OF EXAMPLE - CUT HERE
>> #delim ;
>> version 12.0;
>> sysuse auto, clear;
>> global tflist "";
>> global modseq=0;
>> tempfile temp1;
>> descsave foreign, do(`"`temp1'"', replace);
>> foreach X of var weight length {;
>> local Xlab: var lab `X';
>> global modseq=$modseq+1;
>> tempfile tf$modseq;
>> ttest `X', by(foreign);
>> parmby "regress `X' ibn.foreign, noconst",
>> format(estimate min* max* %8.2f p %-8.2g) idstr("`Xlab'")
>> saving(`"`tf$modseq'"',replace) flist(tflist);
>> };
>> clear;
>> append using $tflist;
>> sencode idstr, gene(outcome);
>> lab var outcome "Outcome";
>> fvregen, do(`"`temp1'"');
>> drop idstr;
>> keyby outcome foreign;
>> desc;
>> list, abbr(32) noobs sepby(outcome);
>> metaparm [iwei=!foreign-foreign], dfcombine(constant) by(outcome) norestore;
>> list, abbr(32) sepby(outcome);
>> eclplot estimate min* max* outcome, hori
>>   estopts(msize(4)) ciopts(msize(5))
>>   yscale(range(0 3)) ylab(1 2) xline(0) xtitle("Difference (95% CI)");
>> **** END OF EXAMPLE - CUT HERE
>>
>> Roger B Newson BSc MSc DPhil
>> Lecturer in Medical Statistics
>> Respiratory Epidemiology and Public Health Group
>> National Heart and Lung Institute
>> Imperial College London
>> Royal Brompton Campus
>> Room 33, Emmanuel Kaye Building
>> 1B Manresa Road
>> London SW3 6LR
>> UNITED KINGDOM
>> Tel: +44 (0)20 7352 8121 ext 3381
>> Fax: +44 (0)20 7351 8322
>> Email: r.newson@imperial.ac.uk
>> Web page: http://www.imperial.ac.uk/nhli/r.newson/
>> Departmental Web page:
>> http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgenetics/reph/
>>
>> Opinions expressed are those of the author, not of the institution.
>>
>> On 13/09/2011 09:46, David Scharff wrote:
>>>
>>> Dear all
>>>
>>> I need to collect the results of a series of ttests (equal variances),
>>> store them in a file together with their p-values. In a second step, I
>>> want to plot the means of the variables with CI's using ECLplot. I'm
>>> using Roger Newson's parmby, factext and metaparm commands. This is my
>>> code. I cannot manage to get factext working it seems, but I do not
>>> figure out where my mistake is. As is obvious, I'm not very
>>> experienced in programming Stata. (I use Stata 12 if this is
>>> relevant).
>>>
>>> global tflist ""
>>> global modseq=0
>>> foreach X of var sem_a sem_b {
>>> global modseq=$modseq+1
>>> tempfile tf$modseq temp1
>>> descsave, do(`temp1', replace)
>>> ttest `X', by(case)
>>> parmby "xi, noomit: regress `X' i.case, noconst", label
>>> format(estimate min* max* %8.2f p %-8.2g) idn($modseq)
>>> saving(`tf$modseq',replace) flist(tflist)
>>> factext, do(`temp1')
>>> metaparm [iwei=!case-case], dfcombine(constant)
>>> saving(`tf$modseq',replace)
>>> }
>>> dsconcat $tflist
>>>
>>> The same, adapted to the auto data for easier inspection:
>>> sysuse auto, clear
>>> global tflist ""
>>> global modseq=0
>>> foreach X of var weight length {
>>> global modseq=$modseq+1
>>> tempfile tf$modseq temp1
>>> descsave, do(`temp1', replace)
>>> ttest `X', by(foreign)
>>> parmby "xi, noomit: regress `X' i.foreign, noconst", label
>>> format(estimate min* max* %8.2f p %-8.2g) idn($modseq)
>>> saving(`tf$modseq',replace) flist(tflist)
>>> factext, do(`temp1')
>>> metaparm [iwei=!foreign-foreign], dfcombine(constant)
>>> saving(`tf$modseq',replace)
>>> }
>>> dsconcat $tflist
>>>
>>> Any help is greatly appreciated - I have spent hours finding my mistake
>>> now...
>>> Many thanks in advance!!
>>> David
>>>
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