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2006 Aug 21
1
Fwd: Re: Finney's fiducial confidence intervals of LD50
...200
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 <- 10^c(logD50 + c(0, -1.96, 1.96) * attr(logD50, "SE"))
> names(D50) <- c("D50", "lower", "upper")
> D50
D50 lower upper
140.8353 103.3171 191.9777
Best,
Renaud
2006/8/21, Renaud Lancelot :
> I don't know what Finney's fiducial confidence interval is...
2006 Aug 21
2
Finney's fiducial confidence intervals of LD50
I am working with Probit regression (I cannot switch to logit) can anybody help me in finding out how to obtain with R Finney's fiducial confidence intervals 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