About the author of softRX freeware...

Robert L. (Bob) Obenchain, Ph.D.

Risk Benefit Statistics LLC

Biostatistics, Non-randomized Studies, Patient Differential Response,
Treatment Selection Bias and Confounding, Incremental Cost-Effectiveness

Professional Interests:

I continue doing active research and development of methods of adjustment for treatment-selection-bias in non-randomized studies ...especially unsupervised propensity scoring ==> Local Control.

I retired from Eli Lilly in August of 2007, where I was a Senior Research Advisor and a Statistics Group Leader for Health Outcomes Research in the US Medical division, Commercial Information Sciences.  Before my 17 years at Lilly, I was at Glaxo in the Research Triangle Park, NC, for almost 5 years.  Before that, I spent 17 years in the Applied Statistics and Quality Assurance Technology departments at AT&T Bell Labs and Bell Communications Research in New Jersey.

I received my PhD in Mathematical Statistics from the University of North Carolina in Chapel Hill in 1969; my thesis advisors were N. L. Johnson and P. K. Sen...

I was elected a fellow of the American Statistical Association in 1997.  I now serve as a Senior Research Fellow at the National Institute of Statistical Sciences (NISS) in Research Triangle Park, North Carolina. I was a Methods Partner with the Observational Medical Outcomes Partnership (OMOP) of the Foundation of the National Institutes of Health in 2009-2010. I have also served as an Adjunct Professor of Biostatistics, first at IU Medical School, Indianapolis, 2005-2013, and then at University of North Carolina, Chapel Hill, 2013-2015.


Bob, Tiffany and Lynne ...at Cannon Mountain, NH, in 1986.

Tiffany received her MBA from Harvard and got married to Spencer Crawford in 2009. They now live in the San Francisco Bay area.  I'm now much too old and fat to ski, but it certainly was much more fun than golf ever was!!!

  • Wine Appreciation

    Our wine cellar has stopped growing!!! Years ago, I started collecting 1997s and later vintages - primarily from California, Washington State and Australia. Today, I still hold a few ancient (undrinkable) bottles of 1981 Bordeaux.  I wish Tiffany had been born in 1982!!!

  • Personal Computer Software Authorship

    I understand that some people actually earn money doing this. But it's just a hobby for me; guess I'm a true hacker!  I started out by learning C at Bell Labs and authoring more than 20 freeware MS-DOS applications with CGA/VGA graphics for Statistical Process Control which I uploaded to CompuServe PCAPP, Library 13, Engr/Tech/Sci between 1988 and 1997.

    Later, I developed a few Windows applications using the C API, but by then I had gradually shifted to concentrate upon developing functions and scripts for major statistical analysis packages: SAS/IML, Gauss, Stata, XLisp-Stat and, most recently, R (packages USPS, ICEinfer and RXshrink.)