L_hNV_rho {ssfa}

SSFA half-normal log likelihood function

Description

This function is used to estimate the parameters of the SSFA model where half-normal distribution of inefficiency term is assumed.

Usage

L_hNV_rho(p, y = y, X = X, sc = sc, w = w, sigmau2_sar = sigmau2_sar)

Arguments

p

a vector with the parameters to be estimated.

y

the dependent variable.

X

the model matrix.

sc

specifies the form of the frontier model (-1 = cost, 1 = production).

w

the spatial weight matrix.

sigmau2_sar

is the variance of the spatial correlated part of the inefficiency term estimated into ssfa.fit function.

Value

Value of the SSFA log likelihood function.

Note

Please note that sigmau2_sar is not a free parameter because it is estimated into the ssfa.fit function.

See Also

ssfa