Source and Accuracy Statements

Data presented in this issue of OmniStats are from the April to October 2002 issues of the BTS Omnibus Household Survey. Data are preliminary and are subject to change. Data for the survey were gathered from approximately 1000 randomly selected households. The data are weighted to allow inferences about the noninstitutionalized population, aged 18 years or older who are currently living in the United States. Because the data come from a sample, they are subject to both sampling and nonsampling error. Sampling error may affect the reliability of an estimate. Nonsampling error can affect both the reliability and accuracy of an estimate and is more difficult to measure. The most general categories of nonsampling error are coverage error, nonresponse error, response error, processing error, and estimation error. BTS will be conducting a follow-up survey in October for information about national security during October. The results of that survey will be available in mid-October.

Please contact the following individuals for additional information about:
the survey: lori.putman@bts.gov
this report: june.jones@bts.gov
press contact: david.smallen@bts.gov