American Statistical Association
New York City
Metropolitan Area Chapter

Memorial Sloan-Kettering Cancer Center
Biostatistics Seminar

Nancy Cook
School of Public Health
Harvard University


Models for risk prediction are widely used in clinical practice to risk stratify and assign treatment strategies. Risk reclassification, or cross-stratification into clinical risk categories, can be used to assess the potential impact of new models on treatment decisions for individual patients. Measures based on this reclassification, including those assessing both calibration and discrimination, will be described and compared to continuous or category-free measures. Advantages of each will be discussed, and performance in practical situations will be examined. Results of simulations estimating the type I error and power for these statistics when adding a new marker to an established or reference model will be presented for a number of scenarios, as well as the impact of the number and type of categories. The type I error appears reasonable in most settings. The relative power of the measures varies depending on the model assumptions. These tools provide unique but complementary information.

Date: Wednesday, March 21, 2012
Time: 11:00 A.M. - 12:00 P.M.
Location: Memorial Sloan-Kettering Cancer Center
Department of Epidemiology and Biostatistics
307 East 63rd Street
(between First and Second Avenues)
Room 331
New York, New York
Note: To gain access to the building, please follow the directions by the telephone in the foyer.


Home Page | Chapter News | Chapter Officers | Chapter Events
Other Metro Area Events | ASA National Home Page | Links To Other Websites
NYC ASA Chapter Constitution | NYC ASA Chapter By-Laws

Page last modified on March 18, 2012

Copyright © 1998-2012 by New York City Metropolitan Area Chapter of the ASA
Designed and maintained by Cynthia Scherer
Send questions or comments to