Estimation of G0I parameters — g0iestimation • SITSAR

Maximum likelihood estimation of the $\mathcal{G}_I^0$ parameters. This is a convenience wrapper around G0I$fit(), kept for compatibility with previous versions of the package.

Usage

g0iestimation(Theta, x, L_fixed = FALSE)

Arguments

Theta: Initial values c(alpha, gamma, L). When L_fixed = TRUE, Theta[3] is the known number of looks.
x: Vector of observations.
L_fixed: Logical; if TRUE, $L$ is held fixed at Theta[3].

Value

Named vector c(alpha, gamma, L) of estimates.

Examples

set.seed(1)
y <- rg0i(1000, alpha = -1.5, gamma = 2, L = 8)
g0iestimation(c(-1, 1, 1), y)
#>     alpha     gamma         L 
#> -1.500017  2.021340 10.188023 
g0iestimation(c(-1, 1, 8), y, L_fixed = TRUE)
#>     alpha     gamma         L 
#> -1.547246  2.139702  8.000000