version 3.2-2
- examples in documentation updated.
- command to extract Heckman model estimates fixed.

version 3.2-1
- penalty matrix in lagrange multiplier test fixed.

version 3.2
- lagrange multiplier test (score test) for testing for the presence of endogeneity or sample selection implemented.
- fisher information matrix in sample selection case fixed.
- empirical random effet calculation fixed.
- examples in documentation updated.

version 3.1
- AT function modified to account for estimated random effects.
- automatic smoothing parameter selection for models with nonparametric random effects.
- examples in documentation updated.

version 3.0
- linear predictors extended to include linear, nonlinear and nonparametric random effects.
- p-value computation in summary.SemiParBIVProbit modified.

version 2.0-4.1
- R documentation and references updated.

version 2.0-4
- AT function extended. 
- R documentation and references updated.

version 2.0-3
- two stage procedure for fully parametric fit fixed. 

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

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.

