Census TransportationCensus TransportationPlanning PackagePlanning Package

Ed J. ChristopherFHWA Resource Center near Chicago

19900 Governors DriveOlympia Fields, IL 60461

708-283-3534

edc@edthefed.com

June 3, 2004June 3, 2004

TodayToday

Briefly overview the CTPPBriefly overview the CTPP

Punctuate some of the more Punctuate some of the more technical issues to be technical issues to be

aware of aware of when working with when working with your datayour data

Give you some TIPs for getting Give you some TIPs for getting startedstarted

WhatWhat is the CTPP? is the CTPP?

The Census Transportation The Census Transportation Planning Package is a set of special Planning Package is a set of special

tabulations from the long form of tabulations from the long form of the decennial census designed by the decennial census designed by

transportation planners for transportation planners for transportation plannerstransportation planners

It summarizes the dataIt summarizes the data

At ResidenceAt ResidenceAt WorkplaceAt Workplace

Flows between Flows between Home and WorkHome and Work

WhatWhat are the CTPP are the CTPP Products?Products?

Tabulations Tabulations at Residenceat Residence

Tabulations Tabulations at Workplaceat Workplace

Flows between Flows between HomeHome and and WorkWork

Part 1Part 1 Part 2Part 2 Part 3Part 3

Who paid for it?Who paid for it?

Buyers/UsersBuyers/Users Direct CostDirect Cost TablesTables

19601960 OMBOMB ?????? ??????

19701970 112112 $0.6 M$0.6 M 4343

19801980 152152 $2.0 M$2.0 M 8282

19901990 $2.5 M$2.5 M 120120

20002000 $3.0 M$3.0 M 203203All StatesAll States

and MPOsand MPOs

When is it due out?When is it due out?

Residence Based TablesResidence Based TablesOct 2002 Mar. 03 AprilOct 2002 Mar. 03 April

June July-August 2003June July-August 2003

CTPP is coming out in 3- waves

Workplace & Worker Flow TablesWorkplace & Worker Flow Tables

Summer 2003 Summer 2003 Fall 2003Fall 2003

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---Winter 2003-2004 and Spring / Summer 2004Winter 2003-2004 and Spring / Summer 2004

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Why all the delay?Why all the delay?

Disclosure Review Board NegotiationsDisclosure Review Board Negotiations (Sept 2001 to Jan 2002)---5 months(Sept 2001 to Jan 2002)---5 months

People Living in Group Quarters Issues People Living in Group Quarters Issues (Jan to May 2003)---5 months(Jan to May 2003)---5 months

Inexcusable delays caused by CB on whether or not 13 Inexcusable delays caused by CB on whether or not 13 tables in CTPP Part 1 could be released. Finally, CB tables in CTPP Part 1 could be released. Finally, CB agreed to allow all but 3 Tables originally identifiedagreed to allow all but 3 Tables originally identified

Dave Clawson, AASHTODave Clawson, AASHTO

Why the 2003 Delay?Why the 2003 Delay?Group Quarters IssueGroup Quarters Issue

Fear by Census Bureau that one could Fear by Census Bureau that one could identify the “characteristics” of workers identify the “characteristics” of workers who live in group quarters by subtractionwho live in group quarters by subtraction

SF3--Workers SF3--Workers who live in who live in

Households and Households and

Group QuartersGroup Quarters

CTPP--CTPP--Workers who Workers who

live in live in Households Households

Workers who Workers who live in Group live in Group

Quarters Quarters -- ==

Modes Used Modes Used Modes Used

The CATThe CATCTPP Access ToolCTPP Access Tool

How is it packaged?How is it packaged?

ASCII TooASCII Too

What is the Distribution What is the Distribution Process?Process?

CDs with Extraction SoftwareCDs with Extraction Software To MPOs and States FirstTo MPOs and States First

(ASCII also available(ASCII also available) ) 30 Day review period30 Day review period

Corrections madeCorrections made

Quantities prepared and RedistributedQuantities prepared and Redistributed

BTS (and others) distribution program(s)BTS (and others) distribution program(s)

What is the Production What is the Production Process?Process?

Typical ProcessTypical Process Preliminary ASCII file producedPreliminary ASCII file produced

Preliminary CAT prepared-IVT filesPreliminary CAT prepared-IVT files

Review and Correction PeriodReview and Correction Period

Final ASCII producedFinal ASCII producedFinal CAT producedFinal CAT produced

Currently, Where are we?Currently, Where are we?

Part 1 -- Residence DataPart 1 -- Residence Data

BTS has Final ASCII version on TranStatsBTS has Final ASCII version on TranStats

Census is working on Final CAT FilesCensus is working on Final CAT Files

Part 2—Work Place DataPart 2—Work Place DataPreliminary ASCII on TranStatsPreliminary ASCII on TranStats

Census working on CorrectionsCensus working on Corrections

Part 3— Flow DataPart 3— Flow DataSlightly different processSlightly different process

Part 3 Part 3 Home Home Work Flow TablesWork Flow Tables

ACSII files on BTS ServerACSII files on BTS ServerTract to TractTract to Tract (May 7)(May 7)

TAZ to TAZTAZ to TAZ (May 25)(May 25)

CAT Software DistributedCAT Software DistributedJulyish?Julyish?

No Corrections ExpectedNo Corrections Expected

Will there be Training?Will there be Training?

Yes! Sort ofYes! Sort of

Provides all basics on understanding, using Provides all basics on understanding, using and working with the CTPP data in a and working with the CTPP data in a transportation planning contexttransportation planning context

Total Total Total TotalDrove Alone Drove Alone Drove Alone Drove Alone

2 Person Carpool 2 Person Carpool 2 Person Carpool3 Person Carpool 3 Person Carpool4 Person Carpool

5-6 Person Carpool7+ Person Carpool

Bus/Trolley Bus Bus/Trolley Bus Bus or Trolley BusStreetcar/TrolleySubway/Elevated

RailroadFerryboat

BicycleWalkedTaxicab

MotorcycleOther Means

Worked at Home Worked at Home Worked at Home

18 Modes 11 Modes 8 Modes 5 Modes

Bicycle/Walked

Taxicab/ Motorcycle/other

Means

Bus/Trolley Bus/ Streetcar/Trolley/ Subway/Elevated/

Railroad/ Ferryboat

Bicycle/ Walked/ Taxicab/

Motorcycle/other Means/ Worked at

Home

Streetcar/Trolley/ Subway/Elevated/

Railroad/ Ferryboat

Bicycle/Walked/ Taxicab/

Motorcycle/other Means

Streetcar/Trolley/ Subway/Elevated

Railroad/ Ferryboat

Means of Transportation to Work

3+ Person Carpool2+ Person Carpool

4+ Person Carpool

SampleSample

Variable ListVariable List

NOTE: Age has 3 NOTE: Age has 3 levels, clusters or levels, clusters or elementselements

Sample Table ListSample Table List

Disclosure Review BoardDisclosure Review Board

CTPP 2000 Post DRB

Part 1: at Residence (121 Tables) All Tables Rounded Zero = 0 1 through 7 = 4 8 though = Nearest Multiple of “5”

Part 2: at Workplace (68 Tables) All Tables Rounded

Part 3: Worker Flows (14 Tables) All Tables Rounded Some Tables with Thresholds

Mode to Work

Circa 1990For 2000

(ROUNDED)

Total 352 350 (not 355!)

Drive Alone 212 210

Carpool 46 45

Transit 59 60

Walk 33 35

Bike 2 4

Example of RoundingExample of Rounding

True Total 354True Total 354

Using the CTPP, 10 + 10 + 10 + 10 = ?Using the CTPP, 10 + 10 + 10 + 10 = ?

Pop Quiz!Pop Quiz!

a)a) 30 30 c)c) 35 35 e)e) 40 40b)b) 45 45 d)d) 50 50 f)f) Any of the Any of the

Above Above

Here's a real life example using the CTPP Part 2 data. Let's Here's a real life example using the CTPP Part 2 data. Let's say my boss asks as simple question: "How many transit say my boss asks as simple question: "How many transit commuters are at work in the Bay Area?" Using the Part 2 commuters are at work in the Bay Area?" Using the Part 2 data, I am able to provide my boss 15 different answers!data, I am able to provide my boss 15 different answers!

Chuck Purvis, MTCChuck Purvis, MTC

Total SOV Carpool Bus Rail Other Home Row TotL11423 49,275 12,200 3,915 6,410 24,580 2,160 10 49,275L11428 29,365 8,315 2,340 4,210 12,780 1,715 4 29,364L11446 15,035 3,705 1,240 2,430 7,010 640 15 15,040L11448 5,200 3,115 550 570 745 150 65 5,195L11449 25,655 7,240 2,120 2,775 12,325 1,195 0 25,655L12427 920 410 155 65 85 95 105 915L12428 9,610 3,025 835 1,660 3,535 555 0 9,610L12446 22,115 4,925 1,770 4,595 9,915 905 0 22,110L12449 67,795 14,565 4,820 8,035 36,950 3,420 0 67,790

Rest 124,955 34,255 10,324 17,410 57,165 5,460 328 124,942 349,896

Col Tot 349,925 91,755 28,069 48,160 165,090 16,295 527

349,896Sum of Column Total

Chicago CBD Chicago CBD --CTPP 2000 DataCTPP 2000 Data

1.1. Obtain your "regional control totals" Obtain your "regional control totals" from from the most geographicallythe most geographically aggregate aggregate summary levels.summary levels.

2.2. Avoid aggregating (summing together) your Avoid aggregating (summing together) your geographiesgeographies

3.3. Avoid aggregating categories.Avoid aggregating categories.4.4. Sum as few categories as possible.Sum as few categories as possible.5.5. Adjust (de-round, un-round) as you see fit. SF3 or Adjust (de-round, un-round) as you see fit. SF3 or

PUMS can provide control totals to adjust the CTPP PUMS can provide control totals to adjust the CTPP Part 1 data.Part 1 data.

6.6. Develop a sense of humor.Develop a sense of humor.

Rounding TipsRounding Tips

So it is "close enough for government work"So it is "close enough for government work"

Table Content

1 Total Workers (1)

2 Vehicles Available (3--zero,one or two+) by Means of Transportation (7 modes)

3 Poverty Status (3 categories)

4 Minority Status (2--white non-hispanic and all others)

5 Household Income (8 classifications)

6 Means of Transportation (17 modes)

7 Household Income (4 classifications) by Means of Transportation (4 modes)

8Mean Travel Time by Means of Transportation to Work (7 modes) and Time

Leaving Home for Work (2--AM peak and all other times)

9Median Travel Time by Means of Transportation to Work (7 modes) and Time

Leaving Home for Work (2 groupings)

10 Aggregate Number of Vehicles by Time Leaving Home for Work (2, see table 8)

11 Number of Workers per Vehicle by Time Leaving Home for Work (2, see table 8)

12 Aggregate Number of Carpools by Time Leaving Home for Work (2, see table 8)

13 Number of Workers per Carpool by Time Leaving Home for Work (2, see table 8)

14Aggregate Travel Time by Means of transportation to work (7 modes) and Time

Leaving Home for Work (2, see table 8)

Part 3: Worker Flow Tables

No record No record thresholdthreshold

Must have 3 Must have 3

unweighted unweighted

recordsrecords

http://www.trbcensus.com/articles/ctppworkers.pdfhttp://www.trbcensus.com/articles/ctppworkers.pdf

Workers at Work Counts vs. Workers at Work Counts vs. Other Employment SourcesOther Employment Sources

Total jobs are HIGHER than CTPP Total jobs are HIGHER than CTPP worker countsworker counts

CTPP uses NAICS, others may use SICCTPP uses NAICS, others may use SIC

Multi-site businesses and job types not reported Multi-site businesses and job types not reported consistentlyconsistently

Census 2000 employment estimates vs CPSCensus 2000 employment estimates vs CPS

Extended Allocation for CTPP small areasExtended Allocation for CTPP small areas

When I get my CTPP CD-ROM HomeWhen I get my CTPP CD-ROM Home

What should I do?What should I do?

Pop it into your CD DrivePop it into your CD Drive

Explore what is on itExplore what is on it

X

Install the Viewer SoftwareInstall the Viewer Software

I let it put it the data viewer with all my other I let it put it the data viewer with all my other operating programsoperating programs

After the machine rebooted and theAfter the machine rebooted and the2020 data viewer (aka the browser)2020 data viewer (aka the browser)was successfullywas successfullyinstalled here isinstalled here iswhat I didwhat I did

Looked to see what was on CDLooked to see what was on CD

Browsed all the files and directoriesBrowsed all the files and directories

Browsed all the files and directoriesBrowsed all the files and directories

Created a Directory Structure where I wanted Created a Directory Structure where I wanted to keep the “to keep the “DataData” and “” and “SessionsSessions””

800 meg800 meg

Moved files from CD including DocsMoved files from CD including Docs

Off to the races using my CTPPOff to the races using my CTPP

With all this said and done now With all this said and done now what can I do?what can I do?

Build Regional and sub-area Data ProfilesBuild Regional and sub-area Data Profiles

Add Trends to your ProfilesAdd Trends to your Profiles

Make the Information AvailableMake the Information Available

Incorporate data into Planning ProcessIncorporate data into Planning Process

Stay ConnectedStay Connected

Are You on the CTPP-News Listserve?

Have You Seen our Newsletter (the Status Report)?

http://www.dot.gov/ctpphttp://www.dot.gov/ctpp

http://www.TRBcensus.comhttp://www.TRBcensus.com

202-366-5000202-366-5000

When Mining Your Census DataWhen Mining Your Census DataKeep us in MindKeep us in Mind

Let Us Know What You Have DoneLet Us Know What You Have DoneWe Are Always Interested We Are Always Interested

Want to…Want to…Show Off Your Work?Show Off Your Work?Gain National Gain National Exposure?Exposure?Meet Other Data Users?Meet Other Data Users?Tour Washington DC?Tour Washington DC?

Sound Exciting?Sound Exciting?

TRB Urban Data and Information Systems CommitteeTRB Urban Data and Information Systems Committee

Ed Christopher-Chair (708-283-3534)Ed Christopher-Chair (708-283-3534)