# coef method for class frontier

### Description

Extract the coefficients from stochastic frontier models
returned by `frontier`

.

### Usage

1 2 |

### Arguments

`object` |
an object of class |

`which` |
character string. Which coefficients should be returned? ('start' for starting values provided by the user, 'ols' for coefficients estimated by OLS, 'grid' for coefficients obtained by the grid search, or 'mle' for coefficients estimated by Maximum Likelihood). |

`extraPar` |
logical. If |

`...` |
currently unused. |

### Value

`coef.frontier`

returns a named vector of the coefficients.

### Author(s)

Arne Henningsen

### See Also

`coef.summary.frontier`

and `sfa`

.

### Examples

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