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st: deming regression


From   Subramanian Swaminathan <ssubra@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: deming regression
Date   Thu, 28 Feb 2008 00:32:01 -0800 (PST)

Dear listers,

I have a problem in giving inputs to the 'deming'
command in stata. From a 
paper by "Cornbleet, PJ and Gochman, N (1979).
Incorrect least squares 
regression coefficients in method-comparison analysis,
Clinical Chemistry 
25, 432-438", I understand that they used a parameter
called 'lambda', which 
is the ratio of the within-individual variance of the
indepdent variable and 
the within-individual variance of the dependent
variable. This parameter can 
be estimated from repeated measurements of depdent and
indepdent variables. 
My question is, do the the values of cv1 and cv2 in
stata are based on the 
values of var1 and var2? if so, how is it related to
the 'lambda' parameter 
of the above stated paper? If such repeat measurements
not available, what 
value should be used for inputting to cv1 and cv2?

thanks in advance
Subramanian Swaminathan
Vector Control Research Centre
(Indian Council of Medical Research)
Indira Nagar
Pondicherry - 605 006
INDIA 



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