front41ReadOutput function

Read output of Frontier 4.1

Read output of Frontier 4.1

Read the output file of Tim Coelli's program Frontier 4.1 that performs stochastic frontier analysis.

front41ReadOutput( file = "front41.out" )

   ## S3 method for class 'front41Output'
print( x, efficiencies = FALSE, ... )

Arguments

  • file: character variable with the name of the file to read.

  • x: object of class front41Output

    (returned by front41ReadOutput.

  • efficiencies: logical. Print all efficiency estimates? (If FALSE, only the mean efficiency is printed.)

  • ...: currently ignored.

Returns

a list of class front41Output containing following objects: - version: the version of Frontier 4.1 that produced the output.

  • insFile: name of the instruction file used by Frontier 4.1.

  • dtaFile: name of the data file used by Frontier 4.1.

  • modelType: model type: either 1 for 'Error Components Frontier' or 2 for 'Tech. Eff. Effects Frontier'.

  • modelTypeName: model type: 'Error Components Frontier' or 'Tech. Eff. Effects Frontier'.

  • functionType: function type: either 1 for 'production function' or 2 for 'cost function'.

  • functionTypeName: function type: 'production function' or 'cost function'.

  • logDepVar: logical. Is the dependent variable logged.

  • olsResults: results of the OLS estimation.

  • nXvars: number X variables (exogenous variables of the production or cost function.

  • olsLogl: log likelihood value of the OLS estimation.

  • gridResults: results of the grid search.

  • mleResults: results of the maximum likelihood estimation.

  • mleLogl: log likelihood value of the maximum likelihood estimation.

  • mleCov: coefficient covariance matrix of the maximum likelihood estimation.

  • lrTest: LR test of the one-sided error.

  • lrTestRestrict: number of restrictions of the LR test.

  • nIter: number of iterations.

  • maxIter: maximum number of iterations set.

  • nCross: number of cross-sections.

  • nPeriods: umber of time periods.

  • nObs: total number of observations.

  • nObsMissing: number of observations that are not in the panel.

  • efficiency: technical efficiency estimates.

  • meanEfficiency: mean efficiency.

Details

A modified version of Tim Coelli's FRONTIER 4.1 that can be used non-interactively is available on http://frontier.r-forge.r-project.org/front41.html. It can be called from within R using the system command (see example). This version is is available as (FORTRAN) source code and (executable) binaries for GNU/Linux and MS-Windows.

References

Battese, G.E. and T. Coelli (1992), Frontier production functions, technical efficiency and panel data: with application to paddy farmers in India. Journal of Productivity Analysis, 3, 153-169.

Battese, G.E. and T. Coelli (1995), A model for technical inefficiency effects in a stochastic frontier production function for panel data. Empirical Economics, 20, 325-332.

Coelli, T. (1996) A Guide to FRONTIER Version 4.1: A Computer Program for Stochastic Frontier Production and Cost Function Estimation, CEPA Working Paper 96/08, http://www.uq.edu.au/economics/cepa/frontier.php, University of New England.

See Also

front41WriteInput, front41Est

Author(s)

Arne Henningsen

Examples

# read the output file that is provided with Frontier 4.1
   outFile <- system.file( "front41/EG1.OUT", package = "frontier" )
   sfa <- front41ReadOutput( outFile )
   print( sfa, efficiencies = TRUE )

   # perform an SFA and read the output
   data( front41Data )
   front41Data$logOutput  <- log( front41Data$output )
   front41Data$logCapital <- log( front41Data$capital )
   front41Data$logLabour  <- log( front41Data$labour )

   front41WriteInput( front41Data, "firm", yName = "logOutput",
      xNames = c( "logCapital", "logLabour" ), 
      path = tempdir(), insFile = "coelli.ins" )

   ## Not run:

   system( paste0( "cd ", tempdir(), "; front41.bin coelli.ins" ) )
   sfa <- front41ReadOutput( file.path( tempdir(), "coelli.out" ) )
   summary( sfa )
## End(Not run)
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