# st: RE: RE: postfile and post using a large number of items

 From "Smith, David W." To "'statalist@hsphsun2.harvard.edu'" Subject st: RE: RE: postfile and post using a large number of items Date Thu, 12 Jun 2003 15:00:37 -0500

```Dear Lee, Thank you that is helpful.

I was once in Thunder Bay.  I drove west from Michigan to Victoria and back.
My wife asked if there was anything north of there.  I said it depended on
whether you insisted on streets to get there.

Regards,

David Smith

David W. Smith, Ph.D., M.P.H.
Associate Professor, Biometry

The University of Texas
Health Science Center at Houston
School of Public Health
San Antonio Regional Campus

8550 Data Point, Suite 200
San Antonio, TX 78229

7703 Floyd Curl Dr., Mail Code 7976
San Antonio, TX  78229-3900

voice: (210)567-3560, fax: (210) 567-5942
e-mail at Houston: david.w.smith@uth.tmc.edu
e-mail at San Antonio: smithd2@uthscsa.edu

-----Original Message-----
From: Lee Sieswerda [mailto:Lee.Sieswerda@tbdhu.com]
Sent: Wednesday, June 11, 2003 4:58 PM
To: 'statalist@hsphsun2.harvard.edu'
Subject: st: RE: postfile and post using a large number of items

This is perhaps an oblique answer to your question. One solution to
extracting what you want from a matrix is to cycle through the matrix using
a -forvalues- loop and matrix subscripting, storing the results as macros,
and posting them as you go. Silly example with auto data:

...first set up tempfile, tempname, postfile, etc....
svyset [weight=weight]
svytab rep78 foreign, se

matrix myV = e(V)
matrix myb = e(b)

* The number of columns in the matrix will equal
* the number of cells in the table
local n = colsof(myb)

forvalues x = 1/`n' {
local df = e(df_r)
local N = e(N)
local se = sqrt(myV[`x',`x'])
local est = myb[1,`x']

post blah blah blah
}

This example produces a dataset with all of the proportions and standard
errors from the -svytab- table.

Regards,
Lee

Lee Sieswerda, Epidemiologist
Thunder Bay District Health Unit
Lee.Sieswerda@tbdhu.com

-----Original Message-----
From: Smith, David W. [mailto:SmithD2@uthscsa.edu]
Sent: Wednesday, June 11, 2003 4:23 PM
To: 'statalist@hsphsun2.harvard.edu'
Subject: st: postfile and post using a large number of items

I would like to use postfile and post with a large number of items, such as
the rates and covariance matrix after svytab.  Is it possible to specify the
items as vectors in order to save space and reduce errors?

Thanks,

David

David W. Smith, Ph.D., M.P.H.
Associate Professor, Biometry

The University of Texas
Health Science Center at Houston
School of Public Health
San Antonio Regional Campus
e-mail at Houston: david.w.smith@uth.tmc.edu
e-mail at San Antonio: smithd2@uthscsa.edu

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```