Subject: Re: [R) Bland Altman plot (was: [R] paste ?)
From: Peter Dalgaard BSA (p.dalgaard@biostat.ku.dk)
Date: Wed 26 Apr 2000 - 06:35:37 EST
Message-ID: <x2vh153ome.fsf@blueberry.kubism.ku.dk>
"Christophe Declercq" <cdeclercq@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@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@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
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