Quantal Response Analysis for Dose-Mortality Data
Reproduce data for the linear model scale-location diagnostic plot
Obtain complete set of LT or LD estimates
Confidence Limits for Lethal Dose Estimate From Dose-response Line
Title Function to calculate ratio of p+eps to 1-p+eps.
Folded Power Transformation
Extract estimates of the intra-class correlation from a glmmTMB model ...
Extract scaling coefficients from vector returned by scale()
Use given vector to identify groups with specified categories
Draw graphs of insect mortality or other exposure-response data
qra: A package for calculations that relate to dose-mortality, or time...
Estimate dispersion as a function of predicted values
First order approximation to variance of y-ordinate to slope ratio
Functions are provided that implement the use of the Fieller's formula methodology, for calculating a confidence interval for a ratio of (commonly, correlated) means. See Fieller (1954) <doi:10.1111/j.2517-6161.1954.tb00159.x>. Here, the application of primary interest is to studies of insect mortality response to increasing doses of a fumigant, or, e.g., to time in coolstorage. The formula is used to calculate a confidence interval for the dose or time required to achieve a specified mortality proportion, commonly 0.5 or 0.99. Vignettes demonstrate link functions that may be considered, checks on fitted models, and alternative choices of error family. Note in particular the betabinomial error family. See also Maindonald, Waddell, and Petry (2001) <doi:10.1016/S0925-5214(01)00082-5>.