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Design and analysis of semi-controlled studies
Swedish National Road and Transport Research Institute, Traffic and road users, Trafikanttillstånd, TIL.ORCID iD: 0000-0002-1849-9722
Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
Swedish National Road and Transport Research Institute, Traffic and road users, Traffic safety, society and road-user.ORCID iD: 0000-0003-4680-4795
Swedish National Road and Transport Research Institute, Traffic and road users, Traffic safety, society and road-user.
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2016 (English)In: Transportation Research Part F: Traffic Psychology and Behaviour, ISSN 1369-8478, E-ISSN 1873-5517Article in journal (Refereed) In press
Resource type
Text
Abstract [en]

Semi-controlled studies provide a hybrid approach in between controlled experiments and naturalistic driving studies. As in controlled experiments, the researcher can assign participants to groups, select the route and define the tasks, but the participants are given more freedom when it comes to if, when, where and how to perform the tasks. Increased flexibility makes it possible to investigate how drivers use tactical behaviour to accommodate task execution. The disadvantage is decreased control and more complicated analyses.

The main objective of this paper is to discuss how to analyse data obtained in semi-controlled studies.The analysis of data from a semi-controlled study include three types of variables:

  • variables that describe the experimental design
  • variables that describe the tactical choices of the participants
  • operational variables such as speed, lateral position or glance behaviour

To analyse the three types of variables a two-step procedure is suggested. First, the tactical indicators are analysed with regard to the experimental design. Second, the operational indicators are analysed and the tactical indicators are used to divide participants into sub-populations.

The semi-controlled design does not need any new statistical procedures to be developed. It is more important that the analysis conditions on the initial properties and not on structures that happen to occur during the experiment, like where the participant chose to do a certain task.We recommend to use the semi-controlled study method when investigating questions involving adaptive and compensatory behaviour on the tactical level. It is especially useful if causal relationships are of interest, if the data collection should be accelerated in comparison to naturalistic studies, and if certain geographical locations definitely should be included.

Place, publisher, year, edition, pages
Elsevier, 2016.
Keyword [en]
Simulator (driving), Driver, Behaviour, Method, Analysis (math)
National Category
Applied Psychology
Research subject
80 Road: Traffic safety and accidents, 841 Road: Road user behaviour
Identifiers
URN: urn:nbn:se:vti:diva-10810DOI: 10.1016/j.trf.2016.06.016ScopusID: 2-s2.0-84978795126OAI: oai:DiVA.org:vti-10810DiVA: diva2:952314
Available from: 2016-08-12 Created: 2016-08-09 Last updated: 2016-08-19Bibliographically approved

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Kircher, KatjaEriksson, OlleForsman, ÅsaVadeby, AnnaAhlström, Christer
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Trafikanttillstånd, TILInfrastructure maintenanceTraffic safety, society and road-user
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Transportation Research Part F: Traffic Psychology and Behaviour
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CiteExportLink to record
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Citation style
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