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Re: st: mice experiment, risk for a clinical manifestation


From   Ronán Conroy <rconroy@rcsi.ie>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: mice experiment, risk for a clinical manifestation
Date   Thu, 8 Jun 2006 13:53:30 +0100

On 7 Meith 2006, at 08:33, Yoshiro Nagao wrote:

Mice are inoculated by pathogens
to see the relationship  between
their immune responses
and whether they manifest as a severe
complication of illness, named "Y".

However, many of the mice (say, 50%)
died from another irrelevant
form of illness "Z", before they
manifest "Y".
("Y" is relatively rare event, while
"Z" is more common)
So there are two outcomes:

1. died of Z (how irritating to die of an irrelevant illness...) and
2. died of Y

Simplest way to handle this is in a multinomial logistic regression with alive as the base category.


=========
Ronán Conroy
Royal College of Surgeons in Ireland
rconroy@rcsi.ie
+353 (0) 1 402 2431
+353 (0) 87 799 97 95
www.flickr.com/photos/ronanconroy




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