version 2.0-2
- inflation factor in the GCV/UBRE score for univariate and bivariate models. 
- two stage procedure to provide starting values in the sample selection algorithm implemented.

version 2.0-1
- GCV smoothing parameter selection allowed for.

version 2.0
- routine for bivariate probit modelling with sample selection implemented.

version 1.0-2
- function ATE suppressed and replaced by AT.

version 1.0-1
- basis dimension in UBRE smoothing parameter selection function fixed.

version 1.0
- plot function fixed.
- function to calculate residuals from fitted model.

version 0.2
- R documentation and references updated.

version 0.1-1
- initial release.

