Four-parametric Weibull function and its definite integral.
Usage
fweibull4(x, p)
aweibull4(p, lower, upper)
Arguments
x
vector of function arguments,
p
vector of function parameters with:
p[1] vertical shift (zero offset),
p[2] vertical scaling,
p[3] shape parameter a of dweibull, and
p[4] scale parameter b of dweibull,
lower
lower limit of the cumulative (integrated) function,
upper
upper limit of the cumulative (integrated) function.
Details
The four-parametric Weibull function is essentially based on the Weibull
density function dweibull and its integral by the Weibull distribution
function pweibull
with two additional parameters for y scaling and zero offset. It can be given
by: