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From |
Nazaria Solferino <solf73@yahoo.it> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re:st:problems with outliers |

Date |
Thu, 8 Aug 2002 13:35:41 +0200 (CEST) |

First, I'm trying to follow your suggestion about using the command >if but I have 12 variables: do you think I could use it the same?(sorry, if pheraphs my question it's a bit silly: but isn't this method the same as dropping observations? I mean Sytata automatically won't take care of the observations which hhavve variables outside the range?) Second, I must realize a regression using a logit model: what's the equivalent command as qreg I could use in that case? Third, I'd like to try also with the method of transformation: could you give me some suggestion about what transformstion should I perform? thank you again to everybody for your support. Hello! I'm a new Stata user and I'm not very good at > using it yet. I hope some one can help with my > problem. I've a large dataset, with some outliers, and > I'd like to manage variables, that I have, only in a > restricted range(without dropping observations) I've > thought I could give a zero value to all veriables > outside a certain range so I mean I should generate a > newvar=oldvar then replace newvar=0 if outside the > range. First, is this a sattistical correct procedure? (Please use informative titles on Statalist messages.) No. Stata will take the new values of 0 just as literally as the old outlying values. One way to exclude outliers is by an -if- condition: e.g. regress y x1 x2 x3 if y < 10000 Naturally, there are other approaches to your problem including 1. a robust technique. I've found -qreg- very good. 2. transformation. 3. -glm- with a nonlinear link (e.g. log). ______________________________________________________________________ Scarica il nuovo Yahoo! Messenger: con webcam, nuove faccine e tante altre novità. http://it.yahoo.com/mail_it/foot/?http://it.messenger.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:problems with outliers***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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