summary.frontier {frontier}R Documentation

summary method for class frontier

Description

Create and print summary results of a stochastic frontier analysis returned by frontier.

Usage

## S3 method for class 'frontier':
summary( object, effic = FALSE,
   logDepVar = TRUE, ... )
## S3 method for class 'summary.frontier':
print( x, effic = x$printEffic, ... )

Arguments

object an object of class frontier (returned by the function frontier).
x an object of class summary.frontier (returned by the function summary.frontier).
effic logical. Print the individual efficiency estimates?
logDepVar logical. Is the dependent variable logged?
... currently unused.

Value

summary.frontier returns a list of class summary.frontier that is identical to an object returned by frontier with two modifications and (up to) four additional elements:

olsParam matrix of OLS estimates, their standard errors, t-values, and P-values.
mleParam matrix of ML estimates, their standard errors, z-values, and asymptotic P-values.
logDepVar logical. Argument logDepVar (see above).
printEffic argument effic.
effic matrix. Efficiency estimates: each row corresponds to a cross-section; each column corresponds to a time period.
efficMean numeric scalar. Mean efficiency.
efficYearMeans numeric vector. Mean efficiency for each year in the sample (only for panel data but not for the Error Components Frontier without time effects).

Author(s)

Arne Henningsen arne.henningsen@gmail.com

See Also

sfa, efficiencies.frontier, and lrtest.frontier.

Examples

   # example included in FRONTIER 4.1 (cross-section data)
   data( front41Data )

   sfaResult <- sfa( log( output ) ~ log( capital ) + log( labour ),
      data = front41Data )
   summary( sfaResult )

   # rice producers in the Phillipines (panel data)
   data( riceProdPhil )
   riceProdPhil <- plm.data( riceProdPhil, c( "FMERCODE", "YEARDUM" ) )

   # Error Components Frontier
   rice <- sfa( log( PROD ) ~ log( AREA ) + log( LABOR ) + log( NPK ),
      data = riceProdPhil )
   summary( rice )

   # Efficiency Effects Frontier
   rice2 <- sfa( log( PROD ) ~ log( AREA ) + log( LABOR ) + log( NPK ) |
      EDYRS + BANRAT, data = riceProdPhil )
   summary( rice2 )

[Package frontier version 0.996-4 Index]