Regression Modeling Strategies

- A non-downward compatible change will occur in the next release of the package
- The survfit.formula function (seen by the user as just survfit) for obtaining nonparametric survival estimates will be replaced by the npsurv function
- The purpose is to avoid conflicts with the survival package
- survfit.coxph has a new id option that generalizes individual=TRUE; need to change survfit.cph and survest.cph to use that

- Overall: http://biostat.mc.vanderbilt.edu/Rrms
- Book: http://biostat.mc.vanderbilt.edu/rms
- CRAN: http://cran.r-project.org/web/packages/rms
- Changelog: https://github.com/harrelfe/rms/commits/master

- Fix survplot so that explicitly named adjust-to values are still in subtitles. See tests/cph2.s.
- Fix fit.mult.impute to average sigma^2 and then take square root, instead of averaging sigma