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From |
chw_wagner@gmx.de |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: access coefficients from another regression |

Date |
Thu, 01 Nov 2012 10:00:41 +0100 |

Thanks a lot for the help. I tried the procedure with some arbitray data. The last part of the regression output looks like follows: ----------------------------------------------------------------------- x | Coef. Std. Err. t P>|t| [95% Conf. Interval ------+---------------------------------------------------------------- Mck | -.2622068 .0173646 -15.10 0.000 -.2962768 -.2281368 Acy | -10.01862 1.684471 -5.95 0.000 -13.3236 -6.713626 Acw2 | -53.35768 4.470133 -11.94 0.000 -62.12823 -44.58712 . mat b = e(b) . mat li b b[1,3] Mck: Acy: Acw2: _cons _cons _cons y1 -.26220681 -10.018615 -53.357676 Than I would like to calculte γ= Mck / Acy . nlcom ( γ: b[1,1]/b[1,2]) γ: b[1,1]/b[1,2] ----------------------------------------------------------------------- x1 | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+-------------------------------------------------------- γ | .026172 . . . . . ----------------------------------------------------------------------- Now my question is: Why is there no Std. Err. given? What did I do wrong? How can I get these values? Thanks a lot for your help. Christina > You need to save the estimate from the first model before you fit the > second. > > For example, a convenient method is to copy estimates to a matrix: > > . mat b = e(b) > . mat li b > > On Tue, Oct 30, 2012 at 12:43 PM, <chw_wagner@gmx.de> wrote: > > > my model consist of two equations x1 und x2 which I estimate seperatly > using non linear least squares in Stata 12. α and β denote the estimated > coefficients, y and z the variables. > > > > First I estimate x1 using: > > nl (x1= {α1}*y1+ {α2}*y2 + {α3}*y3) > > > > Then I estimate x2 using: > > nl (x2= {β1}*z1+ {β2*z2 + {β3}*z3) > > > > After the estimation I want to calculate a new coefficient γ using the > coefficient α1 from the first equation and β1 from the second equation > using the nlcom command, for example: > > > > nlcom (γ= α1/β1) > > > > My question is now, how can I access the coefficient α1 from the first > equation x1? How would the code for the nlcom command look like? * * 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: access coefficients from another regression***From:*Nick Cox <njcoxstata@gmail.com>

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