2015-2016 National Household Travel Survey: What’s ... · 2015-2016 National Household Travel...
Transcript of 2015-2016 National Household Travel Survey: What’s ... · 2015-2016 National Household Travel...
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2015-2016 National Household Travel Survey: What’s Different and New
January 10, 2016
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What’s Different in 2015-2016 Compared to Past NHTS?
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Where We’ve Come From Previous National Personal Transportation Surveys
(NPTS) – 1969: 15,000 HH; Census
– 1977: 18,000 HH; Census
– 1983: 6,500; Census
– 1990: 18,000 national + 4,000 add-on; RTI
– 1995: 21,000 national + 21,033 add-ons; RTI
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Where We’ve Come From 2001 National Household Travel Surveys (NHTS)
– 26,038 national + 43,779 add-ons; Westat and Morpace
– Complex pretesting;
– RDD CATI survey;
– Name change to NHTS - combine NPTS and American Travel Survey
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Where We’ve Come From 2009 National Household Travel Survey
– 25,510 national + 124,637 add-ons; Westat
– RDD CATI survey;
– Dropped ATS module;
– On-line geocoding of trip ends
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Where We Are Now 2015-2016 National Household Travel Survey (NHTS)
– 26,000 national + 103,112; Westat
– Address-Based sample (ABS)
– Two-stage Survey Design
– Multi Mode Data Collection (Paper/Web/CATI)
– New Multi-stage Incentive Structure
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Where We Are Now 2015-2016 National Household Travel Survey (NHTS)
– Tasks Completed To Date
• Develop and Design
– Task in Progress • Pretest
– Future Tasks • Main Survey, Weighting, Data Delivery
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What New in 2015-2016?
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Data Collection Methodology
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Overview of Design
Address-Based Sample (ABS) frame
Two-stage survey with mixed mode approach using mail, web, and
telephone Pretest: November 2015 to January 2016
Main Survey Start: March 2016
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Sample Design
ABS – Targeting 129,000 completed households
– 569 sampling strata (national + 13 add-on areas)
Address sample is being selected in two equal-sized waves – Prior to start of fieldwork
– About 6 months after the start of fieldwork
Sampled addresses will be randomly pre-assigned a day of the week
Sample release process balances assignment of travel days by month
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Design of Survey Materials
FHWA and Westat – Starting point 2009 NHTS materials – Revised based on best practices for a 2-stage ABS Survey
Expert Panel Input in April 2015 – Refine/Simplify invitation letter – Provide person-level guidance with travel log
Cognitive Testing – Recruitment instrument and field materials in April 2015 – Web retrieval instrument in December 2015
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Recruitment Highlights
– Primarily by mail with periodic reminders
– Telephone recruitment option (if respondent requests it)
– Postcard invitation for web recruitment as a nonresponse option
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Travel date assigned
Mail REC survey with
$2 pre-incentive
Day 1
Mail reminder post-card
Day 7
Recruit Survey
returned?
Yes
Mail non-response
postcard with web invitation
Day 44
No
Recruit Survey
Complete?
Continue to Reminders & Retrieval Stage
No Non-Response
Recruit Survey
returned?
Yes
Yes
Mail non-response REC
survey w/o incentive
Day 21
No
Recr
uitm
ent S
tage
Recruit survey
complete?
Mail Recruitment Web Recruitment
No
Yes
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Retrieval Highlights
Seven-day window to report travel 100% of all HHMs 5 or older are eligible Primarily Web-based retrieval instrument CATI interview available to supplement the Web
– Choose phone – Slow to respond
Staged reminder contacts Real time geocoding
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Mail travel logs to recruited households
with $5 incentive
Travel Day - 10
RET preference
is Web?
Travel Day + 1 (Retrieval available)
Retrieval Complete? Travel Day + 2
Yes
No Contact household by phone to complete RET
No Stop outgoing attempts to
reach household
Rem
inde
rs &
Ret
rieva
l Sta
ge
LOG Complete!
Retrieval Complete?
Yes
No
Mail Thank You $20 participation incentive
check
Email/Text confirmation of
recruitment completion
Travel Day - 10
Email/Text/Phone pre-travel day reminder
Email/Text post travel day
retrieval reminder
Email/Text post travel day
second retrieval reminder
Email/Text post travel day
final retrieval reminder
Travel Day + 1 Travel Day - 2 Travel Day + 3 Travel Day + 5
Yes
Note: Reminders will stop once a household completes retrieval.
Current date > TD +7?
Yes
No
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Travel Log Packet
Letter
Exemplar log with completion instructions
Personalized travel logs for each age eligible person
$5 cash incentive
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Travel Log Examples
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Example of a Web Screen
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Data Processing, Quality Assurance, and Control
2015-2016 National Household Travel Survey
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QA/QC and Data Processing
Extensive testing of instruments with real time checks and support systems
Multiple post completion trip processing system checks
– Review / verification by analysts
– Re-contact with respondents
– Re-run all checks
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Data Pass TPS
Checks?
Re-contact household
to clarify issues
Can resolve errors?
No
Yes
Non-Response
Interim Complete
Clarified issues with household?
Yes
No
No
Yes
Run TPS Checks
Trip Processing System Review
Re-contact Households
WebGeoSurvey + TripBuilder
Qualified Persons
Complete?
Real Time Checks
Run Deliverable Preparation
Routines
Deliverable Review
Non-Response
No
Yes
Data Pass All
Checks?
Can resolve errors?
No Non-Response
No
Final Complete
Yes
QA/
QC
Stag
es
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Nonresponse Avoidance
Recruitment phase – sequence of contacts based on design principles for mail
surveys laid out by Dillman, Smyth, and Christian (2009) Retrieval phase
– primary data collection mode is web; reminders and non-response follow-up make use of other modes (email, text, and telephone)
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Pretest
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Interim Recruitment Results as of 1/6/2016
Sample size: 2,886 (50 states plus DC, Atlanta MPO
area, and counties that comprise Tulsa, Oklahoma) Recruitment Response Rate: 27%+
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2015-2016 NHTS Important Changes
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Important Changes
Address Based Sample Multi-mode Data Collection 3 Stages of Incentives Completed HH Definition – 100% of Eligible HHMs Real-time, On-line Geocoding with Map Real-time speed checks with prompts New Questions
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Important Changes
New Questions – Travel Attitudes and Beliefs – Biking – Ride-sharing Services – Expanded Health Questions
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Thank You!