predprobit {LW1949} | R Documentation |
Determine the Effective Dose from a Probit Regression Fit
Description
Determine the effective dose for a specified percent effect from a fitted probit regression model.
Usage
predprobit(pct, pfit, alpha = 0.05, logbase = 10)
Arguments
pct |
A numeric scalar of the effect (as a percent) for which to estimate the effective dose. |
pfit |
An object of class |
alpha |
A numeric scalar, the significance level used to generate
100*(1 - |
logbase |
A numeric or logical scalar, the base of the log transformation used for
dose in |
Value
A numeric vector of length three, the effective dose and the lower and
upper 100*(1 - alpha
)% confidence limits.
Examples
toxdat <- data.frame(
dose=c(0.05, 0.0625, 0.125, 0.25, 0.5, 1),
ntot=rep(8, 6),
nfx = c(0, 1, 4, 4, 6, 8))
myfit <- fitprobit(toxdat)
predprobit(50, myfit)
[Package LW1949 version 1.1.0 Index]