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

Peter Dalgaard BSA p.dalgaard at biostat.ku.dk
Tue Apr 25 22:35:37 CEST 2000

"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   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch

More information about the R-help mailing list