predLines function

Add Litchfield and Wilcoxon Predictions to a Plot

Add predictions from a Litchfield and Wilcoxon model fit to a plot of the results of a dose-effect experiment on the arithmetic scale.

predLines(fit, ...)

Arguments

• fit: A list of length three containing the result of a Litchfield and Wilcoxon model fit, typically the output from LWestimate.
• ...: Additional arguments to lines.

Returns

A solid fitted line is added to the plot. Dashed lines are added to the plot representing the horizontal 95% confidence intervals for the predicted dose to elicit a given percent affected.

Examples

dose <- c(0.0625, 0.125, 0.25, 0.5, 1)
ntested <- rep(8, 5)
nalive <- c(1, 4, 4, 7, 8)
mydat <- dataprep(dose=dose, ntot=ntested, nfx=nalive)
plotDE(mydat)
myfit <- LWestimate(fitLWauto(mydat), mydat)
predLines(myfit)

See Also

plotDE, plotDELP, predLinesLP