Four paramter log-logistic (with implicit inflection point)

To be used by FourPLfit.

Usage

FourPLL2(x, a, bta, k, y0)

FourPLL2_fixa(x, a = 100, bta, k, y0)

FourPLL2_fixy0(x, a, bta, k)

FourPLL2_fixa_fixy0(x, a = 100, bta, k)

FourPLL2_deriv(x, y0, a, b, k)

Arguments

x

The explanatory/independent variable value.

a

Parameter \(a\).

bta

Parameter \(\beta\) where \(b = e^{\beta}\).

k

Parameter \(k\).

y0

Parameter \(y_{0}\).

b

Parameter \(b\).

Value

The calculated response/dependent value value.