Description Usage Arguments Value See Also

The negative log likelihood function is used for estimating the parameters. It varies depending on
the distribution of the inefficence term u.
`L_hNV`

is used by halfnormal distribution of u.
`L_exp`

is used by exponential distribution of u.
`L_trunc`

is used by truncated normal distribution of u.
`L_trunc_mufest`

is used by truncated normal distribution of u and constant mu.

1 2 3 4 | ```
L_hNV(p, y = y, X = X, sc = sc)
L_exp(p, y = y, X = X, sc = sc)
L_trunc(p, y = y, X = X, sc = sc)
L_trunc_mufest(p, mu = mu, y = y, X = X, sc = sc)
``` |

`p` |
vector with the parameters to estimate |

`y` |
response |

`X` |
design matrix of the covariables |

`sc` |
specifies the form of the frontier model (-1 = cost, 1 = production) |

`mu` |
if known, the parameter mu |

returns the value of the log likelihood function

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