front41ReadOutput {frontier}R Documentation

Read output of Frontier 4.1

Description

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

Usage

   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.

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.

Value

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.

Author(s)

Arne Henningsen

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.htm, University of New England.

See Also

front41WriteInput, front41Est

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", "time", "logOutput",
      c( "logCapital", "logLabour" ), insFile = "coelli.ins" )

   ## Not run: 
   system( "front41.bin coelli.ins" )
   sfa <- front41ReadOutput( "coelli.out" )
   print( sfa )
   
## End(Not run)

[Package frontier version 0.9-8 Index]