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From |
Kasal Roman <kasalroman@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: theory reg vs. qreg |

Date |
Mon, 29 Apr 2013 13:30:07 +0200 |

but do you agree with: if "reg" gives me the general results: A) Y1=b1 B) Y2=a2*x+b2 on the same data then must be: Y2=mean(x)*x+b2=b1=Y1 ? Is the assumption clear now? thx On Mon, Apr 29, 2013 at 1:21 PM, Nick Cox <njcoxstata@gmail.com> wrote: > I see no evidence here for that extraordinary claim. > > Sorry, I am still lost on what you want. > Nick > njcoxstata@gmail.com > > > On 29 April 2013 12:17, Kasal Roman <kasalroman@gmail.com> wrote: >> of course I don't mean this, I know a2!=mean(x) but IF you put >> a2=mean(x) you get the first method result with the "reg" command :) >> >> On Mon, Apr 29, 2013 at 12:39 PM, Nick Cox <njcoxstata@gmail.com> wrote: >>> >>> What you want is not at all clear. In fact, you seem confused about some basics. >>> >>> For example, if you fit a regression >>> >>> Y2=a2*x+b2 >>> >>> it's not true that a2 = mean(x). >>> >>> What do you mean by "deactivate" a coefficient? >>> >>> -qreg y- >>> >>> works; it's just a round-about way of calculating the median of -y-, >>> which you can do directly with -summarize-. >>> >>> Nick >>> njcoxstata@gmail.com >>> >>> >>> On 29 April 2013 11:23, Kasal Roman <kasalroman@gmail.com> wrote: >>> > Please, >>> > >>> > >>> > the "reg" command gives me these results: >>> > >>> > A) Y1=b1 >>> > >>> > B) Y2=a2*x+b2 >>> > >>> > then >>> > >>> > Y2=mean(x)*x+b2=b1=Y1 >>> > >>> > >>> > How is it with "qreg"? How could I deactivate the "a2" coefficient >>> > without a need to estimate two functions with the "qreg" command? How >>> > to get the result of "b1" just with the B) method through the "qreg" >>> > command? I know neither mean(x) nor median(x) fit. >>> * >>> * For searches and help try: >>> * http://www.stata.com/help.cgi?search >>> * http://www.stata.com/support/faqs/resources/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/faqs/resources/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/faqs/resources/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/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: theory reg vs. qreg***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: theory reg vs. qreg***From:*Kasal Roman <kasalroman@gmail.com>

**Re: st: theory reg vs. qreg***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: theory reg vs. qreg***From:*Kasal Roman <kasalroman@gmail.com>

**Re: st: theory reg vs. qreg***From:*Nick Cox <njcoxstata@gmail.com>

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