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From |
Nick Winter <nw53@cornell.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Merging matrices |

Date |
Wed, 08 Jun 2005 20:02:30 -0400 |

I'm sure there is something better, but what occurs to me is to use -svmat- and -merge-. Something like this, after the code you've generated:

drop _all

svmat v1

rename v11 value

sort value

save temp1

drop _all

svmat v2

rename v21 value

sort value

merge value using temp1

foreach v in v12 v22 {

replace `v' = 0 if mi(`v')

}

sort value

This would need to be generalized a bit, and would need to rename/label the resulting variables better, etc., but might be a viable approach.

--Nick Winter

At 07:18 PM 6/8/2005, you wrote:

Hello all, I am trying to write a program that (in part) displays a special table showing the frequency counts of two variables. I am currently using -tabulate- on the two variables and extracting the necessary row and frequency names. It's then easy to show TWO tables with the frequencies, via simple matrix subscripting. The difficulty that showing them in one table imposes is that, unless the list of row names is the same in the two variables, displaying the stored frequencies via simple matrix subscripting will line up the rows incorrectly. To make this clearer, consider the following code: ********** clear set obs 100 set seed 1234567 forv i=1/2 { g var`i'=1 replace var`i'=2 if uniform()>.4 replace var`i'=3 if uniform()>.3 } replace var2=4 if var2==3 tab var1, matcell(freqs1) matrow(nums1) mat v1=(nums1,freqs1) tab var2, matcell(freqs2) matrow(nums2) mat v2=(nums2,freqs2) ********** The two resulting matrices will look as follows: . mat list v1 v1[3,2] c1 c1 r1 1 15 r2 2 28 r3 3 57 . mat list v2 v2[3,2] c1 c1 r1 1 21 r2 2 25 r3 4 54 What I would like to create is a hypothetical v3, which looks like this: v3[4,3] c1 c1 c1 r1 1 15 21 r2 2 28 25 r3 3 57 0 r4 4 0 54 I've been poring over the -matrix- commands, and I just can't figure out a way to create this matrix. I've also looked at -tabcount- and -groups-, without success (I know that Nick Cox wrote on these recently, but our library's copy of the SJ is at the bindery, worse luck!). Does anyone have any ideas for producing v3, as described above? Thanks, John-Paul Ferguson * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

-------------------------------------------------------- Nicholas Winter 607.255.8819 t Assistant Professor 607.255.4530 f Department of Government nw53@cornell.edu e 308 White Hall falcon.arts.cornell.edu/nw53 w Cornell University Ithaca, NY 14853-4601 * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**RE: st: Merging matrices***From:*"Scott Merryman" <smerryman@kc.rr.com>

**References**:**st: Merging matrices***From:*John-Paul Ferguson <jpferg@MIT.EDU>

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