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Browsing by Subject "Causality"

Now showing 1 - 4 of 4
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    Examining the Impacts of Residential Self-Selection On Travel Behavior: Methodologies and Empirical Findings
    (University of Minnesota Center for Transportation Studies, 2008-10) Cao, X.(J.); Mokhtarian, P.L.; Handy, S.L.
    Numerous studies have found that suburban residents drive more and walk less than residents in traditional neighborhoods. What is less well understood is the extent to which the observed patterns of travel behavior can be attributed to the residential built environment itself, as opposed to the prior self-selection of residents into a built environment that is consistent with their predispositions toward certain travel modes and land use configurations. To date, most studies addressing this attitudinal self-selection issue fall into nine categories: direct questioning, statistical control, instrumental variables models, sample selection models, propensity score, joint discrete choice models, structural equations models, mutually-dependent discrete choice models, and longitudinal designs. This report reviews and evaluates these alternative approaches. Virtually all of the 38 empirical studies reviewed found a statistically significant influence of the built environment remaining after self-selection was accounted for. However, the practical importance of that influence was seldom assessed. Although time and resource limitations are recognized, we recommend usage of longitudinal structural equations modeling with control groups, a design which is strong with respect to all causality requisites.
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    Response to Van Wee and Boarnet
    (Journal of Transport and Land Use, 2014) Naess, Petter
    This is a reaction to the paper available at https://hdl.handle.net/11299/171221.
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    Tempest in a teapot: The exaggerated problem of transport-related residential self-selection as a source of error in empirical studies
    (Journal of Transport and Land Use, 2014) Naess, Petter
    While numerous studies have investigated influences of built environment characteristics on travel behavior, many scholars are concerned about the confounding effect of residential self-selection. This paper argues that the existence of transport-attitude-based residential self-selection hardly represents any threat to the validity of the basic knowledge on how residential location within urban contexts influences travel behavior. The causal mechanisms by which residential location influences travel behavior exist regardless of whether or not transport-related residential self-selection occurs. Moreover, the cases presented in this paper suggest that residential self-selection based on attitudes to travel is unlikely to represent any great source of error for parameter estimates of the effects of residential location variables on travel behavior as long as “traditional” demographic and socioeconomic variables have already been accounted for. The doubts raised by certain scholars about the implications of attitude-based residential self-selection for the validity of the knowledge base of land use and transportation policies thus appear to be not very well-founded.
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    Transportation Impact of Transitways: A Case Study of Hiawatha Light Rail Transit in Minneapolis
    (Center for Transportation Studies, University of Minnesota, 2013-03) Cao, Jason; Schoner, Jessica
    The Metropolitan Council in the Minneapolis-St. Paul metropolitan area (Twin Cities) aims to greatly increase transit ridership in the next two decades. A network of transitways is an essential component to achieve the ridership goal. Since transitways represent significant infrastructure investments from federal, state, and local governments, the public and planners are interested in their ridership bonus. This study investigated transportation impact of the Hiawatha light rail transit (LRT) using a 2011 dataset collected in the Twin Cities. By employing a match-pair cross-sectional design, we surveyed residents living in the middle section of the Hiawatha LRT corridor and those in two urban control corridors and two suburban control corridors in the region. We first explored the reasons that motivated residents moving into the LRT corridor (or residential preferences) and their connections with transit use. Then we employed a propensity score matching approach to study the impact of Hiawatha LRT on transit use for residents who moved to the corridor before its opening and for those who moved after its opening. Finally, we tested the carryover effect of the LRT and built environment effect on active travel: walking to stores and strolling. The study produced interesting results and offered important implications for land use and transportation policies associated with light rail transit.