Changes in Version 2.5.10 (September 2015)

  o Kendall's tau for the lognormal frailty distrubution available


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 exaple datasets
