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From |
Maarten buis <maartenbuis@yahoo.co.uk> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: How to display standardized residuals plot for interval censored regression |

Date |
Sat, 9 Feb 2008 14:39:20 +0000 (GMT) |

--- Carl Mastropaolo <accuscience@comcast.net> wrote: > I have data which is left-censored (environmental concentration data > which is below a detection limit). I can successfully determine a > regression line to predict concentration from a set of input > independent variables using Interval Regression (intreg). However, > after using intreg, the option no longer exists in > statistics> postestimation > predictions, residuals, etc., > to calculate standardized residuals. A residual is the observed values on the dependent variable minus predicted values. If the dependent variable is censored than that is going to effect the residuals. I still like looking at them, but you have to be careful to intrpret them in the same way as you are used to with normal regression. The example below shows how to compute the residuals. *-------------- begin example ------------------- sysuse auto, clear generate wgt=weight/1000 gen mpg2 = cond(mpg<17,17,mpg) tobit mpg2 wgt, ll(17) predict yhat, e(17,.) gen resid = mpg2-yhat twoway scatter resid wgt if mpg2>17 || /// scatter resid wgt if mpg2<=17 *--------------- end example --------------------- (For more on how to use examples I sent to the Statalist, see http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html ) ----------------------------------------- Maarten L. Buis Department of Social Research Methodology Vrije Universiteit Amsterdam Boelelaan 1081 1081 HV Amsterdam The Netherlands visiting address: Buitenveldertselaan 3 (Metropolitan), room Z434 +31 20 5986715 http://home.fsw.vu.nl/m.buis/ ----------------------------------------- __________________________________________________________ Sent from Yahoo! Mail - a smarter inbox http://uk.mail.yahoo.com * * 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**:**Re: st: How to display standardized residuals plot for interval censored regression***From:*Maarten buis <maartenbuis@yahoo.co.uk>

**References**:**st: How to display standardized residuals plot for interval censored regression***From:*"Carl Mastropaolo" <accuscience@comcast.net>

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