From: Greene, W.H. and D. Hensher (1997) Multinomial logit and discrete choice models in Greene, W. H. (1997) LIMDEP version 7.0 user’s
manual revised, Plainview, New York econometric software, Inc. Download from on-line complements to Greene, W.H. (2011)
Econometric Analysis, Prentice Hall, 7th Edition (data table F18-2) http://people.stern.nyu.edu/wgreene/Text/Edition7/TableF18-2.csv