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11856
2006 Aug 21
2
Finney's fiducial confidence intervals of LD50
...ervals for the levels of the predictor (Dose) needed to produce a proportion of 50% of responses(LD50, ED50 etc.)?
If the Pearson chi-square goodness-of-fit test is significant (by default), a heterogeneity factor should be used to calculate the limits.
Response<-c(0,7,26,27,0,5,13,29,0,4,11,25)
Tot<-rep(30.5,12)
Dose<-rep(c(10,40,160,640),3)
probit<-glm(formula = Response/Tot~ log10(Dose), family=quasibinomial
(link=probit))
D50<- round(10^(dose.p(probit,cf=1:2,p=0.5)))
#This is what SPSS calculates. I would like to reproduce these results with R:
#SPS...
2006 Aug 21
1
Fwd: Re: Finney's fiducial confidence intervals of LD50
...c, bootstrap etc.) for calculating confidence intervals of LD50?
i could "get rid" of Finney's fiducial confidence intervals but only if there was a better method..
any idea?
Renaud Lancelot <renaud.lancelot@gmail.com> wrote:
Date: Mon, 21 Aug 2006 16:35:49 +0200
From: "Renaud Lancelot" <renaud.lancelot@gmail.com>
To: "carlos riveira" <carlos.riveira@yahoo.com>
Subject: Re: [R] Finney's fiducial confidence intervals of LD50
CC: r-help@stat.math.ethz.ch
Sorry there was a typo in my previous reply:
> D50 <- 1...