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| Terms | Definitions |
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| East North Central Division | Ohio, Indiana, Illinois, Michigan, Wisconsin ( American Travel Survey (ATS) 1995 ) | | East South Central Division | Kentucky, Tennessee, Alabama, Mississippi ( American Travel Survey (ATS) 1995 ) | | Education Level | The number of years of regular schooling completed in graded public, private, or parochial schools, or in colleges, universities, or professional schools, whether day school or night school. Regular schooling advances a person toward an elementary or high school diploma, or a college, university or professional school degree. ( Nationwide Personal Transportation Survey (NPTS) ) | | Educational Attainment | The highest grade of school completed as of the date of the first interview determines the educational category of the traveler or household head. ( American Travel Survey (ATS) 1995 ) | | Elapsed Time | The time computed from gate departure time to gate arrival time. ( Airline On-Time Performance Data ) | | Employed | A person is considered employed if there is a definite arrangement for regular full-time or part-time work for pay every week or every month. A formal, definite arrangement with one or more employers to work a specified number of hours a week, or days a month, but on an irregular schedule during the work month is also considered employment. A person who is on call to work whenever there is a need for his (her) services is not considered employed. ( Nationwide Personal Transportation Survey (NPTS) ) | | Express Freight | Property, other than passenger baggage transported by air, with a premium paid over standard freight charges for more rapid delivery. ( Air Carrier Summary Data (Form 41 and 298C Summary Data) ) |
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