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From |
Richard Goldstein <richgold@ix.netcom.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: Other forums [was: RE: st: RE: how to force same excluded groups across regression models] |

Date |
Wed, 12 Oct 2011 14:46:50 -0400 |

if I correctly understand your issue, you want to see -h fvvarlist- and look in the "base levels" section Rich On 10/12/11 2:38 PM, Megan Sheahan wrote: > Thanks Nick. I'll try my question again on here. > > I am attempting to run the same model as pooled OLS, fixed effects, > and CRE. There are a number of interaction terms in my model with > categorical variables. When Stata runs these three models, it chooses > different groups to exclude in the FE model than in the OLS and CRE > models, making the output difficult to compare. For example, I am > interacting three zone groups and four soil groups with N. The CRE and > OLS models keep all three zones and omit the fourth soil group. The FE > model omits the first zone and keeps all four soil groups. Is there > any way to tell Stata to exclude the same groups across regression > models? I tried the following command, but it did not fix the problem: > char varname[omit]. > > For reference, here is the syntax for the three models: > > /* POOLED OLS */ regress yield_ha c.N_ha#zone_comb > c.N_ha#c.N_ha#zone_comb c.N_ha#c.P_ha#zone_comb > c.N_ha#soil_group_megan c.N_ha#c.rain_stress#zone_comb seed_ha > c.seed_ha#c.seed_ha hectares c.hectares#c.hectares masset_ha > c.masset_ha#c.masset_ha rain_stress i.manure i.hybrid > c.rain_stress#hybrid i.legume i.crop_per_field i.dist i.FAO_class > i.year if prod_func == 1, cluster(hhid) > > /* FE */ xtreg yield_ha c.N_ha#zone_comb c.N_ha#c.N_ha#zone_comb > c.N_ha#c.P_ha#zone_comb c.N_ha#soil_group_megan > c.N_ha#c.rain_stress#zone_comb seed_ha c.seed_ha#c.seed_ha hectares > c.hectares#c.hectares masset_ha c.masset_ha#c.masset_ha rain_stress > i.manure i.hybrid c.rain_stress#hybrid i.legume i.crop_per_field > i.dist i.FAO_class i.year if prod_func == 1, fe i(hhid) cluster(hhid) > > /* CRE, WITH POOLED OLS STRUCTURE */ regress yield_ha c.N_ha#zone_comb > c.N_ha#c.N_ha#zone_comb c.N_ha#c.P_ha#zone_comb > c.N_ha#soil_group_megan c.N_ha#c.rain_stress#zone_comb seed_ha > c.seed_ha#c.seed_ha hectares c.hectares#c.hectares masset_ha > c.masset_ha#c.masset_ha rain_stress i.manure i.hybrid > c.rain_stress#hybrid i.legume i.crop_per_field i.dist i.FAO_class > i.year mN_ha mP_ha mseed_ha mhectares mrain_stress mmanure mhybrid > mlegume mcrop_per_field if prod_func == 1, cluster(hhid) > > Many thanks in advance for your suggestions. > > Megan > > > On Wed, Oct 12, 2011 at 11:22 AM, Nick Cox <n.j.cox@durham.ac.uk> wrote: >> Stata tech support, if it falls within their remit? >> >> The main other forum I know of is Stack overflow. There is much less Stata traffic there than on this list. >> >> StataCorp is now on Facebook and Twitter but neither seems well suited to detailed technical questions or answers. >> >> Without bias, and without prejudice of any kind, I'd say that there are more, and more active, experts on this list... >> >> But what is it that can't be answered in this forum? >> >> Very broadly, and without reference to your thread, three main kinds of questions have low probabilities of getting detailed answers on this list. These are expressed in their limiting forms: >> >> * How should I analyse my data? >> >> * I am doing X. Is this correct? >> >> * I am new to Stata. Please give me a personal tutorial on A and B. >> >> And I don't think other lists are, in practice, more reactive to such questions. >> >> Nick >> n.j.cox@durham.ac.uk >> >> Megan Sheahan >> >> Thanks again, Dave. For the broader audience, do you happen to know >> where else I can submit a Stata question if it can't be answered >> through this listserv? >> >> >> * >> * 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/ > * * 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: how to force same excluded groups across regression models***From:*Megan Sheahan <megan.sheahan@gmail.com>

**st: RE: how to force same excluded groups across regression models***From:*"Jacobs, David" <jacobs.184@sociology.osu.edu>

**Re: st: RE: how to force same excluded groups across regression models***From:*Megan Sheahan <megan.sheahan@gmail.com>

**RE: st: RE: how to force same excluded groups across regression models***From:*"Jacobs, David" <jacobs.184@sociology.osu.edu>

**Re: st: RE: how to force same excluded groups across regression models***From:*Megan Sheahan <megan.sheahan@gmail.com>

**Other forums [was: RE: st: RE: how to force same excluded groups across regression models]***From:*Nick Cox <n.j.cox@durham.ac.uk>

**Re: Other forums [was: RE: st: RE: how to force same excluded groups across regression models]***From:*Megan Sheahan <megan.sheahan@gmail.com>

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