Immobility in travel diary surveys |
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Authors: | Jean-Loup Madre Kay W Axhausen Werner Brög |
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Institution: | 1.INRETS-DEST,Arcueil,France;2.IVT,Zurich,Switzerland;3.Socialdata GmbH,Munich,Germany |
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Abstract: | The share of immobile persons, i.e. persons not leaving their homes on a given reporting day, is both a central result and
a prime quality indicator of a travel diary survey. The wide range of values for the share of immobiles reported in travel
diary and time budget survey literature has motivated this in-depth analysis of the reasons for these disparities. This paper
collates available evidence on the share of immobiles in travel diary surveys. The share of these non-travellers (UK), or
no-trippers (US), varies greatly between otherwise similar surveys. After analysing both disaggregate and aggregate information,
this paper concludes that the share of immobiles should be in the range of 8%–12% for the standard one-day, weekday-only travel
diary. The analysis suggests that a substantial share of respondents refuse to participate in a soft way, i.e. by claiming
not to have left the house. In its conclusions, the paper sketches new ways to reduce the share of such soft refusers during
the interview and to identify them during the analysis.
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Keywords: | Travel behaviour Immobile Non-traveller No-tripper Response behaviour Travel diary Disaggregate analysis Meta-analysis |
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