Maximum mean response
MAX estimates the maximum mean response and the dose at which it occurs.
MAX(object, lower = 1e-3, upper = 1000, pool = TRUE)
object |
an object of class 'drc'. |
lower |
numeric. Lower limit for bisection method. Need to be smaller than EDx level to be calculated. |
upper |
numeric. Upper limit for bisection method. Need to be larger than EDx level to be calculated. |
pool |
logical. If TRUE curves are pooled. Otherwise they are not. This argument only works for models with
independently fitted curves as specified in |
This function is only implemented for the built-in functions of class braincousens and
cedergreen.
This function was used for obtaining the results on hormesis effect size reported in Cedergreen et al. (2005).
A matrix with one row per curve in the data set and two columns: one containing the dose at which the maximum occurs and one containing the corresponding maximum response.
Christian Ritz
Cedergreen, N. and Ritz, C. and Streibig, J. C. (2005) Improved empirical models describing hormesis, Environmental Toxicology and Chemistry 24, 3166–3172.
## Fitting a Cedergreen-Ritz-Streibig model lettuce.m1 <- drm(weight~conc, data = lettuce, fct = CRS.4c()) ## Finding maximum average response and the corrresponding dose MAX(lettuce.m1)
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