coef.frontier {frontier}R Documentation

coef method for class frontier

Description

Extract the coefficients from stochastic frontier models returned by frontier.

Usage

## S3 method for class 'frontier':
coef( object, which = "mle", ... )

Arguments

object an object of class frontier (returned by the function frontier).
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).
... currently unused.

Value

coef.frontier returns a named vector of the coefficients.

Author(s)

Arne Henningsen

Examples

   # example included in FRONTIER 4.1
   data( front41Data )
   front41Data$logOutput  <- log( front41Data$output )
   front41Data$logCapital <- log( front41Data$capital )
   front41Data$logLabour  <- log( front41Data$labour )

   sfa <- frontier( front41Data, "firm", "time", "logOutput",
      c( "logCapital", "logLabour" ) )
   coef( sfa, which = "ols" )
   coef( sfa, which = "grid" )
   coef( sfa )

[Package frontier version 0.9-8 Index]