Little Data, Big Data

Presentation to California Transit Association’s Fall Conference & ExpoDavid Orydory@mtc.ca.gov

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13

Little Data

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Pencil & Paper

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InexpensiveResponse rate: LowData quality: Low

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Phone Number + CATI

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ExpensiveResponse rate: lowData quality: very high

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Personal Interview

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ExpensiveResponse rate: highData quality: high

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Big Data

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Image source: SF Examiner16

Track One: Program Operators

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0

100

200

300

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500

600

700

3:00

AM

5:00

AM

7:00

AM

9:00

AM

11:0

0 A

M

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Clip

per®

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nsac

tion

rate

(mea

n ta

gs p

er m

inut

e)

Transaction time

Adult

Youth

RTC

Senior

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$-

$300,000

$600,000

$900,000

$1,200,000

7/1/2015

7/4/2015

7/7/2015

7/10/2015

7/13/2015

7/16/2015

7/19/2015

7/22/2015

7/25/2015

7/28/2015

7/31/2015

e-Cashfa

repaymentrevenue

Traveldate

Other

SFMTA

BART

Track Two: Everyone

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Privacy, privacy, privacyInterest worth the effort?

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Anonymizing scheme7 million observations per monthTransactions for 18 months

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Informing Planning Models

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<fin>

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