An Assessment of NASA's National Aviation Operations Monitoring Service (2009) / Chapter Skim
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3 Sample Surveys: Overview, Examples, and Usefulness in Studying Aviation Safety
3 Sample Surveys: Overview, Examples, and Usefulness in Studying Aviation Safety
Pages 10-15
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From page 10... ...
A few additional examples of government surveys are given in Appendix E Section 3.3 discusses the usefulness and limitations of sample surveys for collecting aviation safety data.
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The use of probability sampling methods allows one to characterize and estimate this error. The sampling error depends on the probability sampling method used; methods for estimating the sampling error are discussed exten sively in the literature.3 There are also several other types of errors (often called nonsampling errors)
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5 The rest of this section describes one particular survey, the National Crime Victimization Survey (NCVS) , in some detail as it shares some key similarities with the NAOMS survey: it uses multiple data sources, many of which are self-reported; it is a national survey designed to collect sensitive data (crime versus aviation safety)
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In 1965, President Lyndon Johnson established a commission to examine the data needs with respect to crime statistics and to propose a solution. The commission recommended in 1968 that a Justice Statistics Center be established and that a national crime survey be implemented on an ongoing basis.
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The same limitation holds for the Near Midair Collision Database. The Operational Error Detection Program data cover only aircraft operating in controlled airspace, so planes flying under visual flight rules, which include a high proportion of general aviation flights, would not be covered.
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However, care must be taken to solicit information from these frontline personnel only when they are in a position to provide accurate and consistent responses. Finding: A sample survey is a scientifically valid and effective way to collect data and track trends about events that are potentially related to aviation safety.
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