Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down at the end of May, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: RE: reliability with ordinal data-Kendall's w?


From   Ronan Conroy <rconroy@rcsi.ie>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: reliability with ordinal data-Kendall's w?
Date   Tue, 14 Dec 2010 11:51:09 +0000

On 13 Dec 2010, at 20:12, Nick Cox wrote:

> I can't see much point to plots of the form re-invented by Bland and Altman in this case. Nor does the limits of agreement approach transfer other than queasily to a 4-point graded scale. -tabplot- from SSC offers one of various graphical alternatives. Diagonal agreement and off-diagonal disagreement will be pretty clear. 


A scatterplot with a large jitter can also be interesting, especially were there are more than two raters. 

As a matter of historical trivia, Bland and Altman didn't claim to have invented the plot, nor did they give it a name in their original paper. The paper, however, became a citation classic (I believe it is the most cited paper the Lancet ever published) and more or less single-handedly eradicated inappropriate analysis of agreement data in biomedicine, something for which we should all be grateful as we get older.


Ronán Conroy
rconroy@rcsi.ie
Associate Professor
Division of Population Health Sciences
Royal College of Surgeons in Ireland


*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index