Activity Number:
|
309
|
Type:
|
Contributed
|
Date/Time:
|
Wednesday, August 14, 2002 : 10:30 AM to 12:20 PM
|
Sponsor:
|
Section on Survey Research Methods*
|
Abstract - #300540 |
Title:
|
A Practical Use for Instrument-Variable Calibration
|
Author(s):
|
Phillip Kott*+
|
Affiliation(s):
|
National Agricultural Statistics Service
|
Address:
|
7413 Tupelo Drive, Derwood, Maryland, 20855, USA
|
Keywords:
|
Brewer weights ; Model unbiased ; Randomization consistent ; invariant
|
Abstract:
|
This talk describes a simple scenario where defining an instrument variable is helpful for computing calibration weights (i.e., weights that satisfy specified calibration equations yet are asymptotically identical to the inverse selection probabilities). The implicit model is simple regression with an intercept. Unless there is an extremely unusual sample, the resulting calibration weights can not be less than unity. A generalization to calibration with multiple auxiliary variables is suggested.
|