frontier (version 0.9-6)

coef.frontier: 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 est

...

currently unused.

Value

• coef.frontier returns a named vector of the coefficients.

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 )