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First record: a methodological approach to counter sampling bias.

Authors
Johnson-LC; Beaton-R; Murphy-SA
Source
Psychol Rep 2004 Oct; 95(2):391-392
NIOSHTIC No.
20029119
Abstract
One goal of survey research is to optimize sampling procedures so that the collected data will produce accurate population estimates. In this context, sampling bias is a primary threat to a study's validity. If individuals who do not respond are a random sample of the population, then the estimates obtained from such a subsample are unbiased. However, as the percentage of nonrespondents increases, the assumption of unbiased estimation becomes increasingly tenuous. At this point an investigator has two choices: delete all subjects who have not provided data as part of the first data collection, or allow a respondent's point of entry to define his baseline measures for the study. No previous discussion of the latter option has been noted in the methods literature. Therefore the authors have termed this approach to baseline the "first record". Conditions under which the "first record" technique would be appropriate or inappropriate are discussed.
Keywords
Occupational-health; Job-analysis; Stress; Questionnaires; Psychological-stress
Contact
University of Washington, Seattle, WA 98195-7263
CODEN
PYRTAZ
Publication Date
20041001
Document Type
Journal Article
Email Address
cjohnson@u.washington.edu
Funding Amount
327060
Funding Type
Grant
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R18-OH-003559
Issue of Publication
2
ISSN
0033-2941
Source Name
Psychological Reports
State
WA
Performing Organization
Washington University, Seattle, Washington
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