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

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

Subject |
st: RE: RE: by and missing values question |

Date |
Mon, 11 May 2009 14:06:14 +0100 |

That was an exaggeration on my part. You could set it up so that the total results were only issued (say) on the last call. But I still suggest just issuing it twice. -help byable- points to details, either way. Nick n.j.cox@durham.ac.uk Nick Cox Question [2] is a good question. You could engineer your program so that it always returned total results too, but the effect would inevitably be that it did that every time round the loop. In practice I'd tend to issue the command twice, once without and once with -by:-. Nikolaos Kanellopoulos I have written the following very simple program cap pr drop logdiff program define logdiff , rclass byable(recall) syntax varlist(min=2 max=2) [if] [in] [fweight aweight] version 8.0 tempvar dif marksample touse qui count local N = r(N) qui count if `touse' if r(N) == 0 error 2000 local n = r(N) qui gen `dif' = (`n'/`N')*abs(ln(`2') - ln(`1')) if `touse' qui su `dif' if `touse' [`weight'`exp'] , meanonly loc diff = r(mean) di as text "Log Difference: " as result `diff' return scalar diff = `diff' return local N = `N' return local n = `n' end My questions are: [1] How can I return the results for all categories when I use the by option and not only for the last category? [2] How can I display and return the results for the total of a category when I use the by option? i.e. return the same results as without the by option. [3] How can I exclude the missing values from my estimations both when I use and not use the by option? * * 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/

**Follow-Ups**:**Re: st: RE: RE: by and missing values question***From:*Nikolaos Kanellopoulos <nkkanel@yahoo.gr>

**References**:**st: by and missing values question***From:*Nikolaos Kanellopoulos <nkkanel@yahoo.gr>

**st: RE: by and missing values question***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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