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From |
Maarten Buis <maartenlbuis@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

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

Date |
Mon, 29 Apr 2013 14:05:47 +0200 |

On Mon, Apr 29, 2013 at 1:49 PM, Kasal Roman wrote: > but this is a fact, just try it with the simple "reg" command: > > A) Y1 = b1 > B) Y2 = a2*X + b2 > > on the same data > then MUST be: > > Y2 = mean(x)*X + b2 = b1 = Y1 > > and I'd like to know if there is something like this possible with the > "qreg" command. Why would Y2 = Y1? I guess you mean that you are using the same dependent/explained/left-hand-side/y-variable in both models, otherwise it is a "fact" that your statement is wrong. If you want to say that you are using the same variable you must make sure you give them the same name throughout. If you are using the same dependent variable your statement is trivial: a linear regression line moves by definition through the point mean(x), mean(y). Nick was asking for you to give exact Stata code. If you had done so, we would not have to guess what you mean with Y1 and Y2 and whether these are the same variables or not. You could for instance have told us: *------------------ begin example ------------------ sysuse auto, clear reg price reg price mpg sum mpg, meanonly di _b[_cons] + r(mean)*_b[mpg] *------------------- end example ------------------- (For more on examples I sent to the Statalist see: http://www.maartenbuis.nl/example_faq ) In that case we would have seen exactly what you meant with Y1 and Y2, i.e. they are both the variable price and thus better referred to as Y or even better price. -- Maarten --------------------------------- Maarten L. Buis WZB Reichpietschufer 50 10785 Berlin Germany http://www.maartenbuis.nl --------------------------------- * * 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/

**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>

**Re: 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>

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