Changes to Version 1.0-1 (07/05-2012)
	- Fix in logLik (nobs)
	- roxygen documentation
	- 

Changes to Version 0.9-10 (22/11-2010)
	- heavytail function (simulate from mv t-distribution)
	- cluster

...

Changes to Version 0.9-6 (16/07-2010)
	- New simulation routine allowing non-linear constraints
	- Various minor bug fixes
	- Optimized code
	
Changes to Version 0.9-5 (29/04-2010)
	- Documentation 
	- Bug fix: Wrong log-Lik/score for models with all fixed intercepts

Changes to Version 0.9-4 (29/04-2010)
	- minor bug fixes

Changes to Version 0.9-3 (29/04-2010)
	- Non-linear regression via 'constrain'

Changes to Version 0.9-3 (21/04-2010)
	- Left & Right censoring
	- Multivariate Probit regression

Changes to Version 0.9-2 (1/04-2010)
	- Non-linear parameter cconstraints

Changes to Version 0.9-1 (24/03-2010)
	- Censored (Tobit) regression
	- minor bug fixes

Changes to Version 0.9-0 (23/02-2010)
	- Instrumental Variable/2SLS estimator
	- profile likelihood confidence limits
	- Robust standard errors
	- bootstrap procedure
	- ... minor bugs removed

Changes to Version 0.8-4 (18/11-2009)
	- Nicer output (CoefMat)
	- Multigroup fixes
	- Code optimization

Changes to Version 0.8-3 (09/11-2009)
	- Modular optimizer
	- Scoring algorithm/Newton Raphson for use with Estimating Equations
	- Inverse Probability of Censoring Weights (IPCW)

Changes to Version 0.8-2 (15/9-2009)
	- Mixture models

Changes to Version 0.8-1 (5/9-2009)
	- Random slopes
	- Documentation
	- Minor bugs (en masse) fixed

Changes to Version ...-0.8-0 (5/9-2009)
	- New package name: lvm (Latent Variable Models)
	- Major fixes in multigroup
	- Design changes wrt. multigroup 
	(lists of models are now used instead of multigroup objects)
	- Bugfix in twinlm (introduced by changes in multigroup)
	- Multigroup model estimation with data MAR
	- FIML with missing covariates (normal dist.)

Changes to Version 0.7-4 (xx/7-2009)
        - Fixed a bug in modelsearch (introduced 0.7-3)

Changes to Version 0.7-3 (30/6-2009)
        - Major improvements in computation efficiency

Changes to Version 0.7-2 (22/6-2009)
	- Standardized coefficients implemented

Changes to Version 0.7-1 (19/6-2009)
	- Bug fix in twin-models (twinlm)

Changes to Version 0.7-0 (18/6-2009)
	- Classic twin-models (twinlm)

