ceilings {NCA}

a set of all available ceiling techniques

Description

Ceilings to use for the nca or nca_analysis methods
> nca(data, c(1, 2), 3, ceilings=c('ols', 'ce_fdh', 'cr_fdh'))

Note that the ols regression line is not a ceiling but is included as a reference.

Ceiling Technique	Name
cols	Corrected Ordinary Least Squares
qr	Quantile Regression
ce_vrs	Ceiling Envelopment with Varying Return to Scale
cr_vrs	Ceiling Regression with Varying Return to Scale
ce_fdh	Ceiling Envelopment with Free Disposal Hull
cr_fdh	Ceiling Regression with Free Disposal Hull
c_lp	Ceiling Linear Programming

Note: The SFA and LH ceiling lines are deprecated (discontinued) from version 3.2.0