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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: Plot residuals against predictors. |

Date |
Tue, 30 Nov 2004 10:09:22 -0000 |

The help for -regress- points you towards a help entry -regdiag- which in turn tells you about -rvpplot- and -rvfplot-. Also the reference manual [R] is informative about these commands. As for the equation, the -regress- output includes a listing of estimated coefficients including the constant (intercept). The user has the burden of translating that into whatever format they prefer e.g. gpa = .590 + .169 hsm + ... Nick n.j.cox@durham.ac.uk flanagan@uchicago.edu > I am completing an analysis of GPA against several high school grade > variables. I have regressed the GPA on the three high school > grade variables, > and calculated and stored the residuals from this regression. > > My output looks like this so far: > > > regress gpa hsm hss hse > > Source | SS df MS Number > of obs = 224 > -------------+------------------------------ F( 3, > 220) = 18.86 > Model | 27.7123302 3 9.23744341 Prob > > F = 0.0000 > Residual | 107.750459 220 .489774812 > R-squared = 0.2046 > -------------+------------------------------ Adj > R-squared = 0.1937 > Total | 135.462789 223 .607456452 Root > MSE = .69984 > > -------------------------------------------------------------- > ---------------- > gpa | Coef. Std. Err. t P>|t| > [95% Conf. Interval] > -------------+------------------------------------------------ > ---------------- > hsm | .1685666 .0354921 4.75 0.000 > .0986185 .2385147 > hss | .0343156 .0375589 0.91 0.362 > -.0397057 .1083368 > hse | .0451018 .0386959 1.17 0.245 > -.0311602 .1213638 > _cons | .5898766 .2942432 2.00 0.046 > .0099804 1.169773 > -------------------------------------------------------------- > ---------------- > > . predict yhat > (option xb assumed; fitted values) > > . predict resid, residuals > > > Now, I am new to stata, just started learning about it this > semester. And I am > trying to plut the residuals versus each of the three high > school grade > variables and versus the predicted value of GPA. How do I do > this? Also, does > stata have a command to obtain the fitted regression equation>? * * 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/

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