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RE: st: retransformation


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: retransformation
Date   Thu, 5 Sep 2002 12:34:03 +0100

1. Smearing 

A specific comment on smearing: most references
comment on smearing (Naihua Duan JASA 1983) 
applied as a fix after log transformation 
of the response variable, which is presumably 
by far the most common case. But the method 
is more general, applying to monotonic, 
continuously differentiable transformations. 

2. GLMs 

I'll repeat a relevant reference 
quoted last month in a different thread. 

There is a very good pedagogic paper 

Lane, P.W. 2002. Generalized linear models
in soil science. European Journal of Soil 
Science 53, 241-251

which focuses on the merits of transformation 
as compared with generalized linear models. 
I owe this reference to Stata user Allan Reese. 

You may be able to access it electronically. 
Don't be put off by the mention of soil science; 
you don't need to understand anything much about 
soil science. The examples are not intrusive. 

Nick 
n.j.cox@durham.ac.uk 


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