Changes in version 4.0.3 (2023-11-28)                  

    o   changes in coxohw.f90, removed Visual Fortran comments

    o   delete licence file, spell checking, add link to git, etc.

                 Changes in version 4.0.2 (2020-06-22)                  

    o   add testthat

    o   add information on the sample size in print and summary

    o   only observations with missing values in variables mentioned in
	the formula are deleted.

    o   add option clusterid in coxphw

                 Changes in version 4.0.1 (2018-04-17)                  

    o   citation and JSS example code is updated due to JSS publication
	2018

                 Changes in version 4.0.0 (2017-01-02)                  

    o   plotshape function replaced by predict.coxphw and
	plot.coxphw.predict, print.coxhpw.predict added.

    o   coxphw.control with arguments iter.max, maxhs, xconv, gconv,
	maxstep, round.times.to, add.constant, pc, pc.time, normalize,
	and fp.iter is added.

    o   coxphw renamed argument print into verbose. maxit is now
	renamed as iter.max as in the survival package. Usage of * in
	the formula of coxphw is now consistent to other R packages
	like lm. Variable names with dots and underlines also work now.
	offset argument was moved to formula.

    o   plotw function is now renamed to plot.coxphw.

    o   linear.predictors in coxphw were corrected if coxphw.control(pc
	= TRUE).

    o   Issue with factors in coxphw is solved.

    o   Issue in coxph in survival (simultaneous use of tt and cluster)
	is solved.

                 Changes in version 3.0.0 (2014-04-08)                  

    o   All fp-transformation functions are declared as internal
	functions.

    o   Add concordance probability to summary.

    o   Add functions: coef, concord, plotshape, wald.

    o   Include data: gastric and biofeedback.

    o   Appearance of plotw plots is slightly changed.

    o   Input is simplified: instead of the options AHR, AHR.norobust,
	ARE, and PH, templates are used now.