fitactf: Fit the AutoCorrelation Transformation Function
In CoSMoS: Complete Stochastic Modelling Solution

Fits the ACTF (Autocorrelation Transformation Function) to the estimated points (ρ_x, ρ_z) using nls.

1	fitactf(actpnts, discrete = FALSE)

`actpnts`	estimated ACT points
`discrete`	logical - is the marginal distribution discrete?

library(CoSMoS)

## choose the marginal distribution as Pareto type II
## with corresponding parameters
dist <- 'paretoII'
distarg <- list(scale = 1, shape = .3)

## estimate rho 'x' and 'z' points using ACTI
p <- actpnts(margdist = dist, margarg = distarg, p0 = 0)

## fit ACTF
fit <- fitactf(p)

## plot the result
plot(fit)