frontier (version 0.9-6)

coef.summary.frontier: coef method for class summary.frontier

Description

Extract the coefficients, their standard errors, t-values, and P-values from stochastic frontier models returned by the summary method for objects of class frontier.

Usage

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

Arguments

object

an object of class summary.frontier (returned by the summary method for objects of class frontier

which

character string. Which coefficients should be returned? ('ols' for coefficients estimated by OLS or 'mle' for coefficients estimated by Maximum Likelihood).

...

currently unused.

Value

• The coef method for objects of class summary.frontier returns a matrix, where the four columns contain the estimated coefficients, their standard errors, t-values, and P-values.

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( summary( sfa ), which = "ols" )
   coef( summary( sfa ) )