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HISTORY OF THE GRAVITY MODEL
PRESENT USE OF GRAVITY MODEL
Initial Decision to be Made III8
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1401 Trip Table Automatic Data Processing blank Bureau of Public CALIBRATING AND TESTING Card column central business district centroid Column Content Control field destination zone end-of-file Error Messages EXAM exponent flow diagram frequency distribution gravity model formula Gravity Model Program gravity model trip Illegal punch index registers input tape intrazonal minimum path traveltimes minutes model theory number of trips Options origin zone origin-destination survey output tape parameter card phase procedure PUBLIC ROADS CALIBRATING punch in column purpose and travel purpose code Routine sample sense switch skim trees SMALL COMPUTER CHAPTER spatial separation study area Table Builder Program tape unit TESTING A GRAVITY total trips travel mode category travel patterns traveltime factors Trees Program trip distribution trip interchanges trip length frequency TRIP LINKING trip purpose trip records Trip Table Builder trips attracted trips produced urban area Urban Planning Division volume group zero zonal trip zone number zone of origin