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HISTORY OF THE GRAVITY MODEL
Data Needed to Determine Parameters III6
6 other sections not shown
adjustment factors Alan Voorhees analysis Appendix for standard BAD CHANNEL BELL system BELMN control BELMN submonitor binary file Binary trip table blank calibration Call card Card columns Contents Card inputs central business district centroids Check limits cols column 72 computer programs Connecticut River control cards Control Data Corporation Correct and start Correct tape criteria card data card destination zones district edited error cards error messages EXAM exponential function field length file card format FORTRAN frequency distribution gravity model formula gravity model program gravity model trip halt Home based trips However IBSYS Identification card Identification Deck Illegal punch improper channel input tape interzonal K factor last card limits for EXAM magnetic tapes minutes modal split model theory node nonhome based trips number of trips number of zones octal off-line operating system operations option origin zone origin-destination survey output record output tape parameter card Parameters Card columns Potomac River printed PROGRAM IBM program library punch cards punch in column purpose code reel RMS ERROR root-mean-square Routine sampling rate selected senior monitor Sense switch set of traveltime skim trees spatial separation specified subroutines survey card Tape assignment card tape unit terminal Traffic Assignment transportation transportation planning travel patterns traveltime factors travertine trees program trip cards trip distribution trip interchanges trip length frequency trip linking trip purpose trip records trips attracted trips produced Univac update urban area Urban Planning volume group zero zonal trip zone numbers zone punch zone-to-zone adjustment