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Changes in Version 2.7.4 (February 2017)
o the observe Fisher information matrix is now returned
as attribute ('FisherI') of the returned object
Changes in Version 2.7.3 (January 2017)
o New baseline hazard family: inverse Weibull (Fréchet)
Changes in Version 2.7 (January 2017)
o optimization is now based on the optimx package
o the default optimizer is now nlminb (from the stats package)
o fixed issue in the likelihood with lognormal frailties
o new function coeff()
Changes in Version 2.6.0 (November 2016)
o new baseline distribution: log-skew normal
Changes in Version 2.5.10 (September 2015)
o added Kendall's tau for the lognormal frailty distrubution
Changes in Version 2.5 (October 2012)
o new frailty distrubution available: lognormal
Changes in Version 2.01 (June 2012)
o Added function anova.parfm() to compare models
Changes in Version 1.01 (March 2012)
o Added stratification
Changes in Version 0.66-2 (February 2012)
o Added example datasets