| coef.summary.frontier {frontier} | R Documentation |
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.
## S3 method for class 'summary.frontier': coef( object, which = "mle", ... )
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. |
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.
Arne Henningsen
# 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 ) )