On Nov 22, 2010, at 2:24 PM, Kenney, Colleen T CTR USA AMC wrote:
Classification: UNCLASSIFIED
Caveats: NONE
A similar question has been posted in the past but never answered. My
question is this: for probit analysis, how do you program a 95%
confidence interval for the LD50 (or LC50, ec50, etc.), including a
heterogeneity factor as written about in "Probit Analysis" by
Finney(1971)? The heterogeneity factor comes into play through the
chi-squared test for homogeneity and is equal to h=chi^2/(k-2),
where k
is the number of doses and k-2 are the degrees of freedom.
I have done a lot of research on this and really appreciate any help
anyone can provide. Thank you!
The reason it may not have had a rely ... assuming the questions was
homomorphic to this one... is that there is no R content in this
question. You may want to post on:
http://stats.stackexchange.com/
But I suggest you be somewhat more descriptive than just citing a 40
year-old text.
--
David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
