   This is release 4 of a survival package for S and Splus.

	Terry M Therneau
	Mayo Clinic

    Copyright Mayo Foundation for Medical Education and Research
    1994, all rights reserved

The main additions of this over release 3 are --

   * can handle correlated error Cox models, by adding a simple "cluster()"
directive to the model statement,

   * can explore time-dependent coefficient models, using cox.zph(),

   * expanded methods for expected survival,

   * allow case weights, which are used in some methods to handle missing
values,

   * expanded methods for expected survival, either based on national rates or
a prior Cox model fit,

   * a host of minor bug fixes.

The details can be found in the Changelog file.
