The views expressed here are those of the individual authors and not necessarily those of the JSM sponsors, their officers, or their staff.
Abstract Details
Activity Number:
|
196
|
Type:
|
Roundtables
|
Date/Time:
|
Monday, August 1, 2011 : 12:30 PM to 1:50 PM
|
Sponsor:
|
Section on Health Policy Statistics
|
Abstract - #300543 |
Title:
|
Beyond Propensity Scores: What Could Be Finer?
|
Author(s):
|
Robert Obenchain*+
|
Companies:
|
Risk Benefit Statistics LLC
|
Address:
|
13212 Griffin Run, Carmel, IN, 46033-8835,
|
Keywords:
|
observational studies ;
propensity scores ;
patient subgroups ;
clustering patients ;
conditional independence ;
local control
|
Abstract:
|
In their classic 1983 paper in Biometrika, Rosenbaum and Rubin (R&R) established that conditioning on a true Propensity Score (PS) causes the joint distribution of patient x-covariates and t-treatment assignments to factor into two independent terms. One factor shows that patients have thereby been conditionally blocked on their x-distributions, while the other term quantifies conditional balance / imbalance on the fractions of patients receiving the two treatment choices. Furthermore, R&R established that the true PS is the "most coarse" of all possible such factoring scores, while the vector of patient-level x-covariates provides the "most fine" factoring score. Our discussion will address the question: "Are there factoring scores between the true PS and the individual x-vectors, and what would be their practical advantages in adjustment for treatment selection bias and confounding in observational studies?"
|
The address information is for the authors that have a + after their name.
Authors who are presenting talks have a * after their name.
Back to the full JSM 2011 program
|
2011 JSM Online Program Home
For information, contact jsm@amstat.org or phone (888) 231-3473.
If you have questions about the Continuing Education program, please contact the Education Department.