-No- Is the Easiest Answer: Using Calibration to Assess Nonignorable Nonresponse in the 2002 Census of Agriculture Report as inadecuate




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The 2002 Census of Agriculture adjusted for whole-farm nonresponse bydividing the potential farms on its list into size classes and then weighting therespondents within each class to account for the nonrespondents.Unfortunately, to assign the size-class memberships, a consistent measureof size was needed for all potential farms not just census respondents.Subsequently-collected census information sometimes contradicts theseclass assignments. By defining indicator variables for census respondentsbased on “corrected” class assignments, instrumental-variable calibrationcan 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.The potential bias in the estimated farm count is caused by nonfarms on thelist being more likely to respond to the census than farms.

Keywords: Weighting class ; Calibration ; Response model ; Instrumentalvariable ; Measurement-error model.

Subject(s): Research Methods/ Statistical Methods

Issue Date: 2005-08

Publication Type: Report

PURL Identifier: http://purl.umn.edu/234388

Total Pages: 16

Record appears in: United States Department of Agriculture (USDA) > National Agricultural Statistics Service (NASS) > NASS Research Reports





Author: Kott, Phillip S.

Source: http://ageconsearch.umn.edu/record/234388?ln=en







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