Bookmark and Share

Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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


From   Tim Evans <[email protected]>
To   "'[email protected]'" <[email protected]>
Subject   RE: st: Collecting ttest results using parmby, factext, metaparm
Date   Wed, 14 Sep 2011 09:37:20 +0100

Dear Roger,

Does the example with CI plots paste easily into Stata 11.2? 

Best wishes
Tim

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of David Scharff
Sent: 14 September 2011 09:12
To: [email protected]
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 <[email protected]>:
> 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 $tflist;
> sencode idstr, gene(outcome);
> lab var outcome "Outcome";
> fvregen, do(`"`temp1'"');
> drop idstr;
> keyby outcome foreign;
> desc;
> list, abbr(32) noobs sepby(outcome);
> metaparm [iwei=!foreign-foreign], dfcombine(constant) by(outcome) norestore;
> list, abbr(32) sepby(outcome);
> eclplot estimate min* max* outcome, hori
>  estopts(msize(4)) ciopts(msize(5))
>  yscale(range(0 3)) ylab(1 2) xline(0) xtitle("Difference (95% CI)");
> **** END OF EXAMPLE - CUT HERE
>
> Roger B Newson BSc MSc DPhil
> Lecturer in Medical Statistics
> Respiratory Epidemiology and Public Health Group
> National Heart and Lung Institute
> Imperial College London
> Royal Brompton Campus
> Room 33, Emmanuel Kaye Building
> 1B Manresa Road
> London SW3 6LR
> UNITED KINGDOM
> Tel: +44 (0)20 7352 8121 ext 3381
> Fax: +44 (0)20 7351 8322
> Email: [email protected]
> Web page: http://www.imperial.ac.uk/nhli/r.newson/
> Departmental Web page:
> http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgenetics/reph/
>
> Opinions expressed are those of the author, not of the institution.
>
> On 13/09/2011 09:46, David Scharff wrote:
>>
>> Dear all
>>
>> I need to collect the results of a series of ttests (equal variances),
>> store them in a file together with their p-values. In a second step, I
>> want to plot the means of the variables with CI's using ECLplot. I'm
>> using Roger Newson's parmby, factext and metaparm commands. This is my
>> code. I cannot manage to get factext working it seems, but I do not
>> figure out where my mistake is. As is obvious, I'm not very
>> experienced in programming Stata. (I use Stata 12 if this is
>> relevant).
>>
>> global tflist ""
>> global modseq=0
>> foreach X of var sem_a sem_b {
>> global modseq=$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
>>
>> *
>> *   For searches and help try:
>> *   http://www.stata.com/help.cgi?search
>> *   http://www.stata.com/support/statalist/faq
>> *   http://www.ats.ucla.edu/stat/stata/
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/

_DISCLAIMER:
This email and any attachments hereto contains proprietary information, some or all of which may be confidential or legally privileged. It is for the exclusive use of the intended recipient(s) only. If an addressing or transmission error has misdirected this e-mail and you are not the intended recipient(s), please notify the author by replying to this e-mail. If you are not the intended recipient you must not use, disclose, distribute, copy, print, or rely on this e-mail or any attachments, as this may be unlawful.


*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index