KIT – University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association www.kit.edu INSTITUTE FOR TRANSPORT STUDIES Answer Young People Just Like Old People? – Impacts and Consequences of Different Household Travel Survey Methods Dr.-Ing. Martin Kagerbauer 7 March 2013 New Techniques and Technologies for Statistics (NTTS), Session 17C: Special session on COST/Shanti, Brussels
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KIT – University of the State of Baden-Wuerttemberg and
National Research Center of the Helmholtz Association www.kit.edu
INSTITUTE FOR TRANSPORT STUDIES
Answer Young People Just Like Old People? – Impacts and Consequences of Different Household Travel Survey Methods Dr.-Ing. Martin Kagerbauer
7 March 2013 New Techniques and Technologies for Statistics (NTTS), Session 17C: Special session on COST/Shanti, Brussels
2 Kagerbauer
Answer Young People Just Like Old People? – Impacts and Consequences of Travel Survey Methods
New Techniques and Technologies for Statistics (NTTS), Brussels Institute for Transport Studies
Agenda
Background of the survey
Different methods of the survey
Comparison of the different survey methods
Response rates, sample sizes, types of households, car-ownership, age, profession, season tickets for public transport
Mobility key figures, modal split and trip purpose
Conclusion and Outlook
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Answer Young People Just Like Old People? – Impacts and Consequences of Travel Survey Methods
New Techniques and Technologies for Statistics (NTTS), Brussels Institute for Transport Studies
Background of the survey
Region of Stuttgart
Conurbation of 179 cities and boroughs
A total of about 2.7 million inhabitants
Household Travel Survey
5,500 households
Multi-day survey
Duration one week
Objectives of the Survey
Update the mobility database
Input for a transport demand model (microscopic and macroscopic)
Information about variability and stability of travel behaviour
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Answer Young People Just Like Old People? – Impacts and Consequences of Travel Survey Methods
New Techniques and Technologies for Statistics (NTTS), Brussels Institute for Transport Studies
Background of the survey
Data collected during the survey
Socio-demographic data concerning the household and all persons living in the household
Trip data with location of origin and destination (transferred into geocodes)
Survey is based on German Mobility Panel (MOP) and combines other survey designs
Sample size
Verification
Sample
Main
Sample
Methode for large
sample size
Check against MOP
Regional Data MiD, ...
Quality assurance Efficiency
5 Kagerbauer
Answer Young People Just Like Old People? – Impacts and Consequences of Travel Survey Methods
New Techniques and Technologies for Statistics (NTTS), Brussels Institute for Transport Studies
Background of the survey
Sample size
Verification Sample approx. 1,000 HH
Main Sample approx.
4,500 HH
PAPI method (paper-pencil-interview)
following the design of the German Mobility Panel
CAWI-method (computer-assisted-
web-interview)
CATI-method (computer-assisted-
telephone-interview)
Survey methods
A lot of questions „Only“ questions required for modelling
6 Kagerbauer
Answer Young People Just Like Old People? – Impacts and Consequences of Travel Survey Methods
New Techniques and Technologies for Statistics (NTTS), Brussels Institute for Transport Studies
Different methods of the survey
PAPI method (Paper-Pencil-interview)
Household and person questionnaire (e.g. number of persons/children living in the household, number of cars, information about the cars, parking situation, public transport situation , sex, age , profession, car and public transport availability etc.)
Trip diary (start and end time of trip, modes used, trip purpose, duration, trip length)
Questionnaire is sent back by mail and plausibility checked
Design based on German Mobility Panel (MOP)
Allows benchmarking without methodological differences
Time-tested method and common practice in Germany
The PAPI-sample serves as verification sample in the comparison of the different survey methods
7 Kagerbauer
Answer Young People Just Like Old People? – Impacts and Consequences of Travel Survey Methods
New Techniques and Technologies for Statistics (NTTS), Brussels Institute for Transport Studies
CATI: Share of „work“ and „business“ is lower due to high share of retiree
CAWI: Share of „education“ is high due to high ratio of young persons
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Answer Young People Just Like Old People? – Impacts and Consequences of Travel Survey Methods
New Techniques and Technologies for Statistics (NTTS), Brussels Institute for Transport Studies
Significant differences between CATI and CAWI methods
Younger people have strong preference to join CAWI survey
Elderly or retired people clearly favor telephone interview
Conclusions and Outlook
PAPI method
Works well and provides reliable results without unexpected non-response effects
CATI + CAWI method
Combination of CATI and CAWI method provides similar results to PAPI method
As a result, most key figures of household and person attributes as well as mobility behavior are affected for both CATI and CAWI method
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Answer Young People Just Like Old People? – Impacts and Consequences of Travel Survey Methods
New Techniques and Technologies for Statistics (NTTS), Brussels Institute for Transport Studies
Conclusions and Outlook
CAWI method alone leads to massive overrepresentation of younger people CATI method alone leads to overrepresentation of elderly people
Combination of CAWI method with more approved methods (especially CATI) is recommended
But: Combination of different survey methods leads to higher costs and complexity of survey
KIT – University of the State of Baden-Wuerttemberg and
National Research Center of the Helmholtz Association www.kit.edu
INSTITUTE FOR TRANSPORT STUDIES
Answer Young People Just Like Old People? –
Impacts and Consequences of Different
Household Travel Survey Methods
Dr.-Ing. Martin Kagerbauer, Karlsruhe Institute of Technology (KIT), Institute for Transport Studies [email protected] (eMail) +49 (721) 608-47734 (phone)