Nhts codebook12/25/2022 ![]() ![]() Regional Travel Characteristics Survey), revealed that only five tested for bias in their sample byĬomparing sample values to independent external sources. Travel Household Interview Survey, 1998-99 Greenville Travel Study, and the 2000 Southeast Florida Northwestern Indiana, 1996 Bay Area Survey, 1996 Broward Travel Characteristics Survey, 1996-97Ĭorpus Christi Study Area Travel Survey, 1997-98 Regional (New Jersey, New York, Connecticut) Statewide Survey, 1993 Wasatch Home Interview Travel Survey, 1995 Origin-Destination Survey for A review of nine travel surveys conducted in the previous decade (1991 California The extent to which bias has been identified in past studies reveals the diversity with which this This would allow bias in individual data sets to be used as a measure of data quality and theĮxtent of bias to be compared among data sets. Useful because it would permit the identification, measurement, and interpretation of bias in a uniform The establishment of standardized procedures in the assessment of bias in travel surveys would be This isĪ condition that can occur quite readily, because drawing a truly random sample from the population isĬomplicated by factors such as the practical difficulty of establishing a perfect sampling frame, having anĮqual likelihood of contacting each sampling unit, and obtaining full response from each sampling unit. Representative of the population, assumptions that it is produces biased estimates of the population. However, even if individual observations are not biased, if the sample is not Of course, bias in individual observations is carried through to aggregate values of the sample such as ![]() Bias can occur within individual observations when, forĮxample, a faulty measurement device is used and a consistent error is introduced into each observation. Sample values from true values in the population. ![]() Sample bias is a systematic error in survey sample data. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages. Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book.
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