[R) Bland Altman plot (was: [R] paste ?)

[Peter Dalgaard BSA]

"Christophe Declercq" <cdeclercq at nordnet.fr> writes:

> > Secondly, I'm curious about the history of this kind of plot.
> > I've only heard it called a "Tukey mean difference" plot, (and
> > Trellis graphics has a function, tmd(), that does it, but no one
> > knows about it...).  Does anyone know who invented it?
> 
> Martin Bland and Doug Altman introduced it in their very successful 1986
> paper in The Lancet (which has become a 'Citation Classic') :

However, as so many other CTs, I don't think they actually invented
the procedure... Plotting residuals vs. fitted values to avoid
correlation, and warnings against the fallacy of plotting a difference
against one of the terms have certainly been around long before '86.

The Lancet paper is not really an introduction of a new method, rather
it is a polemic paper against the widespread practise of publishing
correlation coefficients as measures of agreement between two methods. 

[Of course, since people in the medical profession treats Lancet
papers as The Law, and vocal statisticians like Altman as demigods,
one occasionally meets people trying to use the Bland-Altman plot for
comparing measurements on completely different scales!]

> Bland JM, Altman DG. Statistical methods for assessing agreement between
> two methods of clinical measurement. Lancet 1986; i: 307-310.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
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