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RE: st: correcting skewness of an indep variables
From
Maarten buis <[email protected]>
To
stata list <[email protected]>
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
--------------------------
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