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Re: st: Bootstrapping for model validation

From   "Roger B. Newson" <>
Subject   Re: st: Bootstrapping for model validation
Date   Sun, 07 Apr 2013 15:35:06 +0100

A helpful reference might be Newson (2010).

I hope this helps.

Best wishes



Newson RB. Comparing the predictive power of survival models using Harrell’s c or Somers’ D. The Stata Journal 2010; 10(3): 339–358. Download pre-publication draft from

Roger B Newson BSc MSc DPhil
Lecturer in Medical Statistics
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute
Imperial College London
Royal Brompton Campus
Room 33, Emmanuel Kaye Building
1B Manresa Road
London SW3 6LR
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322
Web page:
Departmental Web page:

Opinions expressed are those of the author, not of the institution.

On 06/04/2013 23:50, Suraj Sharma wrote:
Dear Statalist - I would appreciate your help as a newcomer to Stata. I need to internally validate a Cox regression model using bootstrapping and obtaining a Harrells C-statistic. I know this requires the generation of a program but am unsure as to how to proceed with this. Any help would be appreciated.

Suraj Sharma
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