double.weibull: Double Weibull functions

In fzwaeustc/pcrfn: Peng's Collection of R Functions at Nielsen

Description

There are different double weibull functions used in model fitting. Notice that for double.weibull.a, double.weibull.b and double.weibull.c there are extra balancers added to the original double weibull function shown in details.

Usage

double.weibull(x, a1 = 0.14, b1 = 0.46, a2 = 0.86, b2 = 0.16, duration = 300)
double.weibull.a(x, a1 = 0.14, b1 = 0.46, a2 = 0.86, b2 = 0.16, duration = 300)
double.weibull.b(x, a1 = 0.14, b1 = 0.46, a2 = 0.86, b2 = 0.16, duration = 300)
double.weibull.c(x, a1 = 0.14, b1 = 0.46, a2 = 0.86, b2 = 0.16, duration = 300)

Arguments

x	The minutes within an STBS session, from 1-STBS_duration.
a1	The lambda_1 in the function described in details.
b1	The gamma_1 in the function described in details.
a2	The lambda_2 in the function described in details.
b2	The gamma_2 in the function described in details.
duration	STBS duration in minute.

Details

The basic double weibull function (double.weibull) is expressed as

S(t)=e^{≤ft[-λ_1 (t-1)^{γ_1}\right]}+e^{≤ft[-λ_2(L+1-t)^{γ_2}\right]}

See Also

weibull.

Examples

curve(double.weibull, 1, 301, 10001, xlab="Minutes", ylab="Purity")
curve(double.weibull.a, 1, 301)
curve(double.weibull.b, 1, 301)
curve(double.weibull.c, 1, 301)

fzwaeustc/pcrfn documentation built on May 16, 2019, 4:06 p.m.