A previous discussion is summarized at:
http://core.ecu.edu/psyc/wuenschk/StatHelp/Dichot-Not.doc
a useful tool for visualizing median splits is at:
http://psych.colorado.edu/~mcclella/MedianSplit/
Hope this helps.
Art
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Social Research Consultants
University Park, MD USA
(301) 864-5570
Stephen Senn wrote:
> A lamentable, widespread and inefficient habit in analysing clinical trials
> is to take continuous measurements and dichotomise them prior to analysis.
> (In particular patients are frequently analysed as responders or not.) I
> have my own opinion as to the losses involved in doing this but would like
> to acknowledge priority in what must have been a question that has long
> been studied. I should be grateful for any references to the published
> literature.
> Regards
> Stephen Senn
>
> ==============================================
> Stephen Senn
> Professor of Statistics
>
> Department of Statistics
> 15 University Gardens
> <http://www.gla.ac.uk>University of Glasgow
> G12 8QQ
>
> Tel: +44 (0)141 330 5141
> Fax: +44(0)141 330 4814
> email [log in to unmask]
>
> Private webpage: http://www.senns.demon.co.uk/home.html
> ===============================================
>
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