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Re: st: RE: combining frequency tables


From   Shehzad Ali <sia500@york.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: combining frequency tables
Date   23 Feb 2009 16:42:43 +0000

Thanks, Nick. Excel isn't the software preference; I just wanted to export the output into a project document.

I tried implementing your suggestion but the output isn't what I was wanted. -mdes- (original) gives me missing, total and missing/total for each time point and each treatment separately and I want them all on one table. I tried -mmdes- as suggested for each use variable separately and saved each result like this:

-mmdes- for use1

mat A

-mmdes- for use2

mat B

and so on.. and finally:

mat F = A, B, C, D, E

or
mat F = A + B + C + D + E

mat list F

This returns only one row for use1 with zero missing and nothing for any other use variables or time points. Am I doing something wrong here (pls excuse my poor knowledge of stata programming)?

Thank you,
Shehzad

On Feb 23 2009, Nick Cox wrote:

As I've said before, there's no virtue in simple questions. We want
_interesting_ questions!
This seems to be a question about Excel to the extent that it raises
another question: Can't you do that in Excel if that's a tool of choice?
(No idea from me.)
But there are also many Stata answers. -findit mdesc- reveals that it is
a program by Rose Anne Medeiros, who once wrote a program called -njc-,
for which I am not responsible. Here is a matrix version of her program,
for which she is not responsible. *! mmdesc 1.0 NJC 23 February 2009 * mdesc 1.0 RAM 18 JULY 2008
* Returns a table with number missing, total, and missing/total
program mmdesc, rclass byable(recall)
version 8 syntax [varlist] [if] [in]
tempvar touse
mark `touse' `if' `in'
local nvars : word count `varlist' tempname matrix matrix `matrix' = J(`nvars', 3, .) local i = 1 quietly foreach var of local varlist { count if missing(`var') & `touse' matrix `matrix'[`i', 1] = r(N) count if `touse' matrix `matrix'[`i', 2] = r(N) matrix `matrix'[`i', 3] = `matrix'[`i',1] / `matrix'[`i',2] local ++i } matrix rownames `matrix' = `varlist' matrix colnames `matrix' = Missing Total Missing/Total matrix list `matrix', noheader return matrix table = `matrix' end

Once you run this, you can save its results by e.g. mat A = r(table) ... mat B = r(table)
...

mat C = A + B

Nick n.j.cox@durham.ac.uk
Shehzad Ali

Another (perhaps) simple question: is it possible to add different frequency tables together to form a combined single table in Excel?

I have two group variables (say, var1: type of treatment; and var2: time

point of observation) and 5 use variables. So an observation would be
for treatment A at time point 1. I want to know the number of missing values

for each use variable for each treatment group and each time point. Also

for each use variable there are 'if' conditions, so I can't do the frequency count in one go. Here is what I am doing using a user written programme -mdesc- or -missing-:

by treatment timpoint: mdesc use1 if (condition1 condition2)

by treatment timpoint: mdesc use2 if (condition3 condition4)

and so on.

Now I want to combine all these counts for all timepoints and treatment groups to get a single table that I can export to Excel. Is there any way I could do that?

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