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

[Ron�n Conroy <rconroy@rcsi.ie>]

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.


=========
Ron�n 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




*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/