summary.frontier {frontier} | R Documentation |
Create and print summary results of a stochastic frontier analysis
returned by frontier
.
## S3 method for class 'frontier': summary( object, effic = FALSE, logDepVar = TRUE, ... ) ## S3 method for class 'summary.frontier': print( x, effic = x$printEffic, ... )
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. |
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). |
Arne Henningsen arne.henningsen@gmail.com
sfa
, efficiencies.frontier
,
and lrtest.frontier
.
# 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 )