Three-parameter Weibull (type 2) model with upper limit fixed

A three-parameter Weibull type 2 model with the upper limit fixed at a specified value. The model is given by the equation $$f(x) = c + (\mathrm{upper} - c)(1 - \exp(-\exp(b(\log(x) - \log(e)))))$$

Usage

W2.3u(upper = 1, fixed = c(NA, NA, NA), names = c("b", "c", "e"), ...)

Arguments

upper

numeric value giving the fixed upper limit (default 1).

fixed

numeric vector of length 3, specifying fixed parameters (use NA for parameters that should be estimated).

names

character vector of length 3 giving the names of the parameters (default c("b", "c", "e")).

...

additional arguments passed to weibull2, most notably method (a character string: "1" (default), "2", "3", or "4") which selects the self-starter method for obtaining starting values. See weibull2 for details.

Value

A list of class "Weibull-2" as returned by weibull2.

See also

weibull2, W2.3, W2.4