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

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

Subject |
RE: st: correcting skewness of an indep variables |

Date |
Tue, 16 Mar 2010 01:24:31 -0700 (PDT) |

--- On Mon, 15/3/10, Lachenbruch, Peter wrote: > If the observations are identifiable a priori (e.g., > hospitalization cost if not hospitalized) you can use a > two-part model. See Lachenbruch, P. A., (2001) > "Comparison of competitors to the two part model" > Statistics in Medicine 20(8) 1215-1234 Lachenbruch, P. A. > (2002) "Analysis of Data with Excess Zeros" Statistical > Methods in Medical Research 11(4) 297-302 > The second reference is an introduction to a volume of SMMR > on this problem. Don't these references deal more with the case where such variables are the depenent/explained/y variable, rather than the case where such variables are the independent/explanatory/x variable? If I understood the original question correctly, than that question concerned the latter case, and the solution I proposed (add the original variable + a dummy indicating which observation had a spike value and which not) is certainly only appropriate for that latter case. -- Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**RE: st: correcting skewness of an indep variables***From:*"Lachenbruch, Peter" <Peter.Lachenbruch@oregonstate.edu>

**References**:**RE: st: correcting skewness of an indep variables***From:*"Lachenbruch, Peter" <Peter.Lachenbruch@oregonstate.edu>

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