Data set used for example 4.10, p.128, of An introduction to Efficiency and Productivity Analysis, 2nd edition.
data("multil_data")
A data frame with 12 observations on the following 3 variables.
x1
quantities of Mainland Freight services (1,000 NTKs)
x2
quantities of Tasrail Freight services (1,000 NTKs)
x3
quantities of Passenger services (1,000 PTKs)
T. J. Coelli, D. S. Prasada Rao, C. J. O'Donnell, and G. E. Battese. An introduction to Efficiency and Productivity Analysis, 2nd edition. Springer Science + Business Media, New York, 2005.