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From |
"Kakatua Kutta" <[email protected]> |

To |
[email protected] |

Subject |
RE: st: Urgent: Saving Coefficient |

Date |
Fri, 26 Mar 2004 00:07:40 -0500 |

Thanks Roger for the help. I was wondering whether I cound get a Stat version 7 for "parmby" command? I have stata7 and all I get on the web is version 8 of parmby. Kakatua ----- Original Message ----- From: Roger Newson <[email protected]> Date: Thu, 25 Mar 2004 21:26:23 +0000 To: [email protected] Subject: RE: st: Urgent: Saving Coefficient > At 16:11 25/03/04 -0500, Dev Vencappa wrote: > >Thanks a lot for your help. The loop ran for a few observation this time > >but stopped again saying "insufficient observations". Obviously, it > >stopped because of unability to run the regression with too few > >observations. Is there any way to make it ignore insufficient numbers and > >complete the loop? > > > > This looks like a possible job for -parmby-, which is part of the -parmest- > package, downloadable from SSC. -parmby- is programmed only to fail if the > regression command fails for all by-groups, and will complete without error > if the regression command only fails for some by-groups. > > I hope this helps. > > Roger > > >----- Original Message ----- > >From: "Nick Cox" <[email protected]> > >Date: Thu, 25 Mar 2004 10:36:16 -0000 > >To: <[email protected]> > >Subject: RE: st: Urgent: Saving Coefficient > > > > > (Apologies for previous premature post.) > > > > > > You could identify the problematic > > > observations upstream and ignore > > > them systematically. Also the -regress- > > > must be on subsets for this to make sense. > > > > > > use data > > > gen coeff = . > > > egen nmiss = rmiss(gdp year) > > > encode countrycode if nmiss == 0, gen(id) > > > su id, meanonly > > > > > > qui forval i = 1/`r(max)' { > > > reg gdp year if id == `i' > > > replace coeff=_b[year] if id == `i' > > > } > > > > > > Note also -statsby-. > > > > > > Nick > > > [email protected] > > > > > > Dev Vencappa > > > > > > > > Thank a lot Dev. But I ran into a rather weird problem while > > > > applying it to real data. It seems that the loop abruptly > > > > stops whenever their are missing values for variables used > > > > in the regression. In my case, the data starts with e.g. BAN > > > > and gdp for BAN is all missing like this: > > > > > > > > Country Code Year GDP > > > > BAN 1960 . > > > > BAN 1965 . > > > > BAN 1970 . > > > > > > > > > > > > The loop does not produce any result and gives "no > > > > observation" and just stops. > > > > > > > > Any suggestions? > > > > > > > > Kakatua > > > > I tired with some fake data where I had missing values for a > > > > variable and could not replicate this problem . But try to > > > > add an extra condition in the loop, which is to ignore > > > > observations that have missing values for GDP. Therefore, > > > > your new loop would be: > > > > > > > > use data > > > > sort countrycode year > > > > encode countrycode,gen(id) > > > > tsset id year > > > > gen coeff=. > > > > forv id=1/2 { > > > > reg gdp year > > > > replace coeff=_b[year] if id==`id' & gdp!=. > > > > } > > > > > > > > Give that a try. > > > > > > * > > > * 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/ > > > >-- > >___________________________________________________________ > >Sign-up for Ads Free at Mail.com > >http://promo.mail.com/adsfreejump.htm > > > >* > >* 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/ > > > -- > Roger Newson > Lecturer in Medical Statistics > Department of Public Health Sciences > King's College London > 5th Floor, Capital House > 42 Weston Street > London SE1 3QD > United Kingdom > > Tel: 020 7848 6648 International +44 20 7848 6648 > Fax: 020 7848 6620 International +44 20 7848 6620 > or 020 7848 6605 International +44 20 7848 6605 > Email: [email protected] > Website: http://www.kcl-phs.org.uk/rogernewson > > Opinions expressed are those of the author, not the institution. > > * > * 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/ -- ___________________________________________________________ Sign-up for Ads Free at Mail.com http://promo.mail.com/adsfreejump.htm * * 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: Urgent: Saving Coefficient***From:*Roger Newson <[email protected]>

**RE: st: Urgent: Saving Coefficient***From:*Richard Williams <[email protected]>

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