Users' Guide for the Public Use Tapes April 1980
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USERS’ GUIDE FOR THE PUBLIC USE TAPES APRIL 1980 “., U.S.DepartmentofTransportation/FederalHighwayAdministration NOTE: OrIJuly 21, 1981,as a resultof a reviewof the CensusBureau ~losure policy,additionalgeographicdetailon the locationof many NFTS householdswas providedto the FederalWgkway Adm3.nistratiun. This addeddata has been incorporatedinto the publicuse tape,sndhas resultedin the followingchange: User’aGuidepage 72, AppendtiC. 1977NPTS RecordLayoutand Documentation. S~ #l: RouseholdRecord, P-2. Field 24-27 SMSA Code has been chqed. The new recordlayout shouldread: Field 24-26 %A Code See list attachedto back cover. Field 27* CensusRegionCode (Blank,1, 2, 3, 4) I - Northeast 2 - NorthCentral 3 - South 4 - West Blafi - Regionnot disclosed * Field 27 was previouslyincludedin the sMSA CocleS d ~= always ~ero, therefore,haviugno signifcsnce. I . I f Attacbnt 1 SMsA Code Akron OG8 Allentom.Bethlehm.Easton G24 -... Alb~y-Schenectsdy-Troy 016 AtXanta 052 Baltimore 072 Birmingham 100 Boston 112 Chicago 160 Cincinnati 164 Cleveland 168 Dallas 192 Dayton 200 Detroit 216 Flint 264 Fresnn 284 GrandRapids 300 Rartford 328 RoustOn 336 Indianapolis 348 . JerseyCity 364 RausasCity 376 Lansing 404 New York 560 Philadelphia 616 r Pittaburg 628 Portland 644 Code Rochester 6W St. buis 704 San Bernadim-Riverside-ont~iO 728 San Diego 732 S~acuse 816 Toledo Mo Washington,D,C, 884 YOungstOm-Werren 932 Region %ortheast NorthCentral South West . I-. I Field bcation Le~th Item Description Value Range and Codes 24-26 3 SMSA Code See list attsc~edto back page . 27 ‘ 1 CensusRegton (Blank,1, 2, 3, 4) 1 - Northeast r . “1 . 1977 NationwidePersonalTransportationStudy Users’Guide for PublicUse Tapes Preparedby: Ruth H. Asin HighwayStatisticsDivision Officeof HighwayPlanning . , CONTENTS Page I. Introduction............................................... 3 Sponsorship................................................ 3 . Purpose.................................................... 3 Scope ..................................................... 4 “1 . SampleDesignand SurveyMethodology....................... 4 Data Processing............................................ 6 SpecialTabulations........................................ 6 II. 1977 NPTS Questionnaire NTS-2 ..................................................... 7 NTS-2A .................................................... 9 EditingProcedures........................................ 12 III. 1977 NPTS RecordLayoutand Documentation................. 15 IV. WeightingSpecificationsfor Data from the 1977 NPTS Introduction............................................. 16 Definitionsof the Key Termsused in the EstimatingProcedure .............................:....... 17 TravelDay EstimatingProcedure........................... 18 TravelPeriodEstimatingProcedures....................... 22 v. Comparisonof 1977 NPTS with the 1969 NPTS ExpandedScopeof the 1977 NPTS .......................... 33 Recodingsand TriplinktngProcedures...................... 33 1 APPENDICES Page A. Glossaryof TermsUaed in NPTS .........................., 40 B. 1977 NPTS Questionnaire NTS-2: DetailedPersonalInterview(SectionsI-VI)..49 NTS-2A: DetailedPersonalInterview(SectionVII)...68 c. 1977 NPTS RecordLayoutand Dcoumentstion................ 71 D. OccupationalClassificationSystem-OccupationCodes ..... 123 E. IndustrialClassificationSystem-IndustryCodes ......... 130 F. WPTS PublicUse Tape Request............................. 14’3 TABLES 1. TravelDay Time InflationFactors........,.........!..... 19 2. Pi Factorsto be appliedto W. Household TravelPeriodTrip Weights............V.................. 24 3. TravelPeriodTime InflationFactors..................... 26 4. Estimatesof SelectedControlTota3sfor Variablesfrom the 197? NPTS ............................. 29 I 5. StatisticalFormulaeto ProduceEstimatesof Trips (Vehicles/Person),Miles of Travel (Vehicle/Person)and Characteristics (Household/Person)for DifferentTime Periods............ 30 .. 6. Recodeand TriplinkingRules to Change1977NPTS Trip PurposeCodes to 1969NPTS Trip PurposeCodes ....... 36 ..’ 7. 1977-1969NPTS Trip Purposesand Codes ................... 39 I 2 L--.....—... -..-.. —-...... I. Introduction ~is guidepresentsinformationon the 1977 NationwidePersonal TransportationStudy (NPTS). The 1977 ~TS was designedto updatethe earlierstudydone in 1969 to providecomprehensivedata on traveland transportationpatternsin the UnitedStates. fiis guidedescribesthe background,scopeand purpoaeof the study;providesinformationon the samplingmethods,and collectionand processingprocedure; describesthe :, .NPTS estimatingproceduresused to craateweighteddata and includes documentationof each of the eight tape filesmade availableon the publicuse tape. In addition,recodingand triplinkingproceduresfor use in recodingof the 1977 NPTS trip purposeafor comparabilitywith the 1969 trip purposesand for preparingdata summariesfor the two periods are also Inclllded.A Glossaryof TechnicalTerms (AppendixA) defines conceptsand/ortermsused in the documentation.Copiesof the questionnaire and an order formwith descriptionand price of the publicuse tapesare also foundin the Appendix. Standarderrorsof estimatesand measures of samplingvariabilitycalculatedfrom data collectedfor thia Studywill be availablein early Summer1980. Sponsorship The 1977 NPTS was conductedby the Bureauof the Census under the sponsorshipof the Departmentof Transportation(DOT)as part of the expandedscopeof the NationalTravelProgram. The National TravelProgramis part of the Censusof Transportation,which is conducted every five yearsby the Bureauof the Censusand includesthe National TravelSurvey (NTS). In 1977, the NationalTravelProgramalso included the 1977 NPTS and providedprofilesof the volumeand characteristics of travelby the civilianpopulation. Purpose The purposeof the 1977 NPTS was to addressthe full rangeof trips and travelin the UnitedStates,alongwith the relatedaocialand ., economiccharacteristicsof the tripmaker. The 1977 NPTS was deaignedto collectinformationon all tripstaken duringa designated24-hourperiodand some additionaldetailon tripsand of 75 miles-or-mnreduringthe preceding14-dayperiod. The 1977 NPTS collectedinformationon the use and availabilityof publictransportation facilities,typesof motorizedvehicleaavailableto the household, characteristicsof the tripstaken,includingrode,purpose,milea traveled, time required and personson the trip: The additionalinformationobtained for tripsof 75 miles-or-moreincludedstopsduringthe trip and uses of additionalmodes of transportation.One of the most uniquefeatureaof the 1977 NPTS was the attemptto estimatethe amountof travelin urban and rural areasby the use of mappingduringthe home interview. (Seediscussing of the NPTS Questionnaire,NTS-2a;SectionVII - Msppingof PrivateNctor VehicleTrips.) 3 - The 1977NPTS ie simil~ to but more comprehensivethan th* 1969 NPTS. The scope of the 1977NPTS was expandedfrom the 1969NPTS to includethe following: 1. Detailedtrip purposeinfo-tion for 21 trip purposes. Among the trip purposesaddedin 1977were conventions,sightseeing, entertainment,recreation(participant),ovarofghtlodging,oocial, returnhome, changeof vehiclewithoutchangeof mode, changemeans ‘ of transportationand pickupor leavaoff passengers. 2. Detailedmotorizedvehicleinformationfor eachmotorizedvehicle - ownedor availablefor use bym=bers of the houqehold. ~is includes type of vehicle,model year,make and model,the presance/absence of air conditioning,n~ber,of cylinders,etc. See ~TS Questionnaire NTS-2;SectionI - MotorizedVehicleRecord. In addition,where available,theFederalHighwayAdministration(WA) peraonneladded the follting informationfor each vehicleto the PublicUae Tape (Segment3): curbweight, shippingweight,Inerttaweight,tiport code,citymiles per gallon (mpg),highwaympg, and combinedmpg. 3. Detailedtripsand travelinformationfor perem who drive as an essentialpart of theirjob. See NPTS Questiomneire,IPfS-2; SectionIV - DriverInformation. 4. Long trip informctfonincluding.Btops=de enroutetO the destinationfor tripsof 75 milee-or-more(oneway) thmt ended duringa designated14-daytravelperiod. Tbus, tripsand travel informationin the 1977NPTS was collectedfor a 15-dayperiod: the travelday for all travelregardlessof trip length,and the 14 days -ediately precedingthe travelday for tripsof 75 miles-and-longer only. 5. Identificationof the ubban/rnralsplitof travelfor all tripsmade by privatemotorizedvehicles. ~is wae accomplishedby . the use of maps which identifiedthe urbanboundaryfor ea~ .. geographicalarea in the emaple. The respondentwas aeked to trace on the map all privatemotorvehicletripsmada on the tr~el day or duringthe 14-daytravelperiod. The informationobtainedfrom the - “ ~pPfn6 waa laterueed to eet~te the urban/ruralsplit of traval. SampleDeaiRn The 1977 NFTS was based on anational probabilityample of 24,466 householdsselectedfrom each of the 30 Statesand the Districtof Columbia and representingthe totalciviliannoninstitutionalpopulationof’the UnitedStatea. Of the 24,466households,3,433unitawere foundto be vacant,demolished,convertedto nonresidentialuee, or otheti~e ineligible for the survey. Scme 3,084household were not interviewedbece-e the occupantswere not at hnme afterrepeatedcalls,refusedto participate in the survey,or were unavailablefor some otherreason. 4 All of the sampleunits consistedof householdsthst had previously been interviewedfor the CurrentPopulationSurvey (CPS). The CPS is a stratifiedmultistageclustersample. In the first stage,the UnitedStateewas dividedinto 1,030primaryeamplingunits