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From |
"Al-Zakwani, Ibrahim" <IAl-Zakwani@healthcore.com> |

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

Subject |
st: RE: RE: Regplot Problems! |

Date |
Wed, 19 Feb 2003 14:27:38 -0500 |

Nick Cox, Many thanks for the reply and sorry for the mistake.. However, even after rectifying this, an error still occurs.. Please find another example below.. Thanks again... Ibrahim . sysuse auto, clear (1978 Automobile Data) . regress mpg weight Source | SS df MS Number of obs = 74 -------------+------------------------------ F( 1, 72) = 134.62 Model | 1591.9902 1 1591.9902 Prob > F = 0.0000 Residual | 851.469256 72 11.8259619 R-squared = 0.6515 -------------+------------------------------ Adj R-squared = 0.6467 Total | 2443.45946 73 33.4720474 Root MSE = 3.4389 ---------------------------------------------------------------------------- -- mpg | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+-------------------------------------------------------------- -- weight | -.0060087 .0005179 -11.60 0.000 -.0070411 -.0049763 _cons | 39.44028 1.614003 24.44 0.000 36.22283 42.65774 ---------------------------------------------------------------------------- -- . . regplot invalid label specifier, : `"data and fit for Mileage (mpg)"': invalid syntax invalid syntax r(198); -----Original Message----- From: Nick Cox [mailto:n.j.cox@durham.ac.uk] Sent: Wednesday, February 19, 2003 1:51 PM To: statalist@hsphsun2.harvard.edu Subject: st: RE: Regplot Problems! Al-Zakwani, Ibrahim > Just to add to a question that was posted earlier regarding > <regplot> > I am also experiencing problems.. > Below, please find the output.. > I would appreciate any insight as to what might be a problem... > I am using Stata version 8 - Windows 2000 > Thanking you in advance.. > > Ibrahim > > > . sysuse auto > (1978 Automobile Data) > > . regress foreign > > Source | SS df MS > Number of obs = > 74 > -------------+------------------------------ F( > 0, 73) = > 0.00 > Model | 0 0 . Prob > > F = > . > Residual | 15.4594595 73 .211773417 > R-squared = > 0.0000 > -------------+------------------------------ Adj > R-squared = > 0.0000 > Total | 15.4594595 73 .211773417 Root > MSE = > .46019 > > ------------------------------------------------------------ > ---------------- > -- > foreign | Coef. Std. Err. t P>|t| [95% Conf. > Interval] > -------------+---------------------------------------------- > ---------------- > -- > _cons | .2972973 .0534958 5.56 0.000 .1906803 > .4039143 > ------------------------------------------------------------ > ---------------- > -- > > . regplot > variable _cons not found > no variables defined > no variables defined > r(111); > This one's different. You fitted a regression with response and no predictor. That's perfectly meaningful and -regress- bounced back the mean of foreign at you. However, -regplot- expects to pick up a predictor from among the -regress- results, but it can only find _cons, and Stata tells -regplot- that no such variable exists, because _cons is just Stata jargon for the intercept. There is an interesting little question of program design here. I as programmer should trap this. I can think of two possibilities. 1. You want this ================ . regress foreign was entirely deliberate and you do want to see -regplot-, which would be a single horizontal line y = mean of foreign and anything you like on the horizontal axis. That wouldn't be tremendously interesting or useful but it would be valid, except that it would be quite arbitrary what I plot the data for foreign against. 2. You made a mistake ===================== You forgot to specify a predictor and haven't spotted that yet. -regplot- should say, "Excuse me, no predictor variable". I incline to 2. Nick n.j.cox@durham.ac.uk * * 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/ * * 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/

**Follow-Ups**:**st: RE: RE: RE: Regplot Problems!***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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