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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: RE: combining frequency tables |

Date |
Mon, 23 Feb 2009 18:18:50 -0000 |

I don't have your data and more importantly can't reproduce your error. Joining matrices rowwise works for me. There is no programming required, just matrix manipulations as documented under -matrix-. . mmdesc rep78 mpg price if foreign Missing Total Missing/Total rep78 1 22 .04545455 mpg 0 22 0 price 0 22 0 . mat A = r(table) . mmdesc rep78 mpg price if !foreign Missing Total Missing/Total rep78 4 52 .07692308 mpg 0 52 0 price 0 52 0 . mat B = r(table) . mat C = A, B . mat li C C[3,6] Missing Total Missing/Total Missing rep78 1 22 .04545455 4 mpg 0 22 0 0 price 0 22 0 0 Total Missing/Total rep78 52 .07692308 mpg 52 0 price 52 0 Nick n.j.cox@durham.ac.uk Shehzad Ali 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)? On Feb 23 2009, Nick Cox wrote: >-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 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? * * 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/

**References**:**st: combining frequency tables***From:*Shehzad Ali <sia500@york.ac.uk>

**st: RE: combining frequency tables***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**Re: st: RE: combining frequency tables***From:*Shehzad Ali <sia500@york.ac.uk>

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