JSM 2005 Online Program

Abstract #303459

This is the preliminary program for the 2005 Joint Statistical Meetings in Minneapolis, Minnesota. Currently included in this program is the "technical" program, schedule of invited, topic contributed, regular contributed and poster sessions; Continuing Education courses (August 7-10, 2005); and Committee and Business Meetings. This on-line program will be updated frequently to reflect the most current revisions.

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Activity Number:	478
Type:	Topic Contributed
Date/Time:	Thursday, August 11, 2005 : 8:30 AM to 10:20 AM
Sponsor:	Section on Survey Research Methods
Abstract - #303459
Title:	'No' Is the Easiest Answer: Using Calibration To Assess Nonignorable Nonresponse in the 2002 Census of Agriculture
Author(s):	Phillip S. Kott*+
Companies:	National Agricultural Statistics Service
Address:	3251 Old Lee Highway, Fairfax, VA, 22030, United States
Keywords:	Weighting class ; Calibration ; Response model ; Instrumental variable ; Measurement-error model
Abstract:	The 2002 Census of Agriculture adjusted for whole-farm nonresponse by dividing the potential farms on its list into size classes and then weighting the respondents within each class to account for the nonrespondents. Unfortunately, to assign the size-class memberships, a consistent measure of size was needed for all potential farms, not just census respondents. Subsequently-collected census information could contradict these class assignments. By defining indicator variables for census respondents based on "corrected" class assignments, instrumental-variable calibration can be used to construct an alternative set of nonresponse weights. Assuming the response model underpinning these new weights is correct, the bias from using the original set of nonresponse weights can be assessed, particularly the bias in the estimated farm count caused by nonfarms on the list being more likely to respond to the census than farms.

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