Qi Li, Desheng Ouyang, and Jeffrey S. Racine, "Categorical 
Semiparametric Varying Coefficient Models," Journal of Applied 
Econometrics, Vol. 28, No. 4, 2013, pp. 551-579.

This file contains R code based on the np package to replicate the
wage example of this paper.

The code is titled vc_discrete.R. Results were generated using R
2.13.0 and the np package version 0.40-6

The files vc_discrete.R and vc_discrete.Rout are zipped in the file
progs-lor.zip. They are ASCII files in DOS format, so Unix/Linux users
should use "unzip -a".

Jeffrey S. Racine
racinej [AT] mcmaster.ca