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Personne :
Thériault, Marius

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Thériault

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Marius

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Université Laval. Département de géographie

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ncf10011427

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Voici les éléments 1 - 10 sur 19
  • PublicationAccès libre
    Modeling spatio-temporal diffusion of carsharing membership in Québec City
    (Elsevier, 2014-05-29) Coll, Marie-Hélène; Thériault, Marius; Vandersmissen, Marie-Hélène
    During the last few years, car sharing has undergone significant growth, both in Canada and around the world. In this type of service, users share access to a fleet of vehicles, thereby giving them most of the advantages of automobile use, such as its temporal and spatial flexibility, without many of the constraints of ownership. This study analyzes the geographical and socio-economic factors that favour membership of a carsharing service in Québec City. We combined Cervero’s and Kockelman’s 5D model (density, diversity, design, distance to transit, and destination accessibility) with Hägerstrand’s concept of innovation diffusion so as to analyze the evolution of potential car-sharing membership. Zero-inflated negative binomial (ZINB) regression was used to model the spatial diffusion of the number of car-sharing members in Québec City from 1996 (two years after its inauguration) to 2008 at the local scale, with an annual time step. Results indicate that the carsharing distribution did, indeed, follow Hägerstrand’s innovation diffusion model and that, even though some of the 5D model significantly influenced membership, it was socio-economic factors (education, non-motorization, and family structure) that most greatly affected the membership rate in the service area. The model is used to assess and discuss market coverage potential in Québec City. Keywords: carsharing, sustainable mobility, Hägerstrand’s innovation diffusion model, 5D model, spatiotemporal modeling
  • PublicationRestreint
    Le choix de la forme fonctionnelle dans la théorie hédonique : retour sur un vieux débat
    (Regional and Urban Studies Centre, Institute of Public Affairs, Dalhousie University, 2011-12-15) Thériault, Marius; Des Rosiers, François; Dubé, Jean
    Cet article reprend un vieux débat lié au choix de la forme fonctionnelle paramétrique adaptée pour spécifier l’équation de prix hédonique. Bien que la transformation proposée par Box & Cox (1964) soit générique et permette de normaliser les distributions des variables dépendante et indépendantes, son utilisation a été très limitée durant les dernières décennies, cédant la place aux formes fonctionnelles classiques de type loglinéaire, semi-log et linéaire. Grâce à une série de tests portant sur le pouvoir prédictif de plusieurs formes de modèle et sur le comportement de leurs résidus, cette recherche vise à vérifier s’il est possible d’identifier, avec les marchés résidentiels unifamiliaux de la ville de Québec comme étude de cas, une forme fonctionnelle supérieure aux autres. Les résultats montrent que la spécification log-linéaire demeure, parmi les alternatives étudiées, une forme fonctionnelle paramétrique intéressante étant donné ses performances et sa simplicité d’interprétation. Par ailleurs, des régressions auxiliaires sur les résidus permettent d’identifier quelques problèmes liés à l’estimation des coefficients avec l’approche des moindres carrés ordinaires. L’article se termine par une réflexion sur la méthode d’estimation qui devrait être explorée dans les recherches futures.
  • PublicationAccès libre
    Segmentation spatiale et choix de la forme fonctionnelle en modélisation hédonique
    (Armand Colin, 2011-06-27) Thériault, Marius; Des Rosiers, François; Dubé, Jean
    Cet article propose différentes façons d’intégrer l’hétérogénéité spatiale dans l’équation de prix hédonique en utilisant un modèle emboîté. À partir d’une définition préalable de sous-marchés, différents types de modèles sont estimés pour la ville de Québec. Si les différentes options considérées sont au moins préférables à l’approche classique étant donné la variation spatiale de certaines contributions marginales des attributs résidentiels, rien n’indique pour autant que le modèle le plus désagrégé s’avère nécessairement le meilleur outil de modélisation. Nous montrons comment un modèle log-linéaire simple peut être amélioré en introduisant des effets fixes reliés aux différences structurelles et historiques des sous-marchés. Si cette approche ne règle pas en totalité les problèmes associés au modèle de prix hédonique classique, elle en diminue largement l’impact, tout en assurant une stabilité des coefficients associés aux attributs physiques de la propriété.
  • PublicationRestreint
    Economic impact of a supply change in mass transit in urban areas : a Canadian example
    (Elsevier, 2010-10-13) Thériault, Marius; Des Rosiers, François; Dubé, Jean; Dib, Patricia
    This paper aims at estimating the economic impact of a supply change in the bus transit service in a Canadian city of medium size. By using a quasi-experiment approach and a difference-in-differences (DID) estimator, it evaluates the impact of the introduction of a rapid bus transit (RBT) in Quebec City (Canada) through a spatio-temporal analysis of house price variations. The hedonic price model shows that the new service generates an increase in house price ranging from 6.9% to 2.9%, for those properties located close to the service corridor where the population is quite dense and where the service was offered initially. Using sales transaction data and municipal assessment records from 1997, the effect on price is translated into an economic impact for the whole region. The paper shows that the improvement in public transit supply generates, for Quebec City, a significant fiscal impact estimated to $6 M and a plus-value for properties owners close to $35 M over 12 years. Finally, the implications of this kind of analysis for urban planning and development are discussed.
  • PublicationAccès libre
    La perception spatio-temporelle de l’accessibilité automobile aux services urbains : mesures pour la ville de Québec, 1993-2004
    (CNRS-UMR, 2012-11-26) Thériault, Marius; Des Rosiers, François; Voisin, Marion; Dubé, Jean
  • PublicationRestreint
    Using a fourier polynomial expansion to generate a spatial predictor
    (Emerald, 2012-06-06) Thériault, Marius; Des Rosiers, François; Dubé, Jean
    Purpose Spatial autocorrelation in regression residuals is a major issue for the modeller because it disturbs parameter estimates and invalidates the reliability of conclusions drawn from models. The purpose of this paper is to develop an approach which generates new spatial predictors that can be mapped and qualitatively analysed while controlling for spatial autocorrelation among residuals. Design/methodology/approach This paper explores an alternate approach using a Fourier polynomial function based on geographical coordinates to construct an additional spatial predictor that allows to capture the latent spatial pattern hidden among residuals. An empirical validation based on hedonic modelling of sale prices variation using a large dataset of house transactions is provided. Findings Results show that the spatial autocorrelation problem is under control as shown by low Moran's I indexes. Moreover, this geo‐statistical approach provides coefficients on environmental amenities that are still highly significant by capturing only the remaining spatial autocorrelation. Originality/value The originality of this paper relies on the development of a new model that allows considering, simultaneously spatial and time dimension while measuring the marginal impact of environmental amenities on house prices avoiding competition with the weight matrix needed in most spatial econometric models.
  • PublicationRestreint
    The geography of overweight in Quebec : a multilevel perspective
    (Canadian Public Health Association, 2009-12-01) Thériault, Marius; Hamel, Denis; Lebel, Alexandre; Pampalon, Robert.
    OBJECTIVES: Explore the contextual aspects of overweight in Quebec through multilevel modelling, using a purposely designed set of spatial units and a few area-based characteristics. METHODS: Data came from the Canadian Community Health Survey (CCHS Cycle 2.1). Multilevel logistic regressions were performed to test for the presence of an independent contextual effect on overweight and obesity (BMI > or = 25 kg/m2), separately for men and women. Modelling considered individual attributes, including some lifestyle aspects, and contextual characteristics. A geographic grid integrating spatial elements related to overweight and obesity in the literature was developed. Also, an area-level residuals analysis was carried out to identify spatial units presenting higher or lower odds of being overweight. RESULTS: After accounting for individual and area-level characteristics, there remain significant geographic variations in overweight in Quebec. Although this contextual effect is small for men and women, many spatial units differ significantly from the provincial average. There are differences between the geography of overweight in men and women which suggest that socio-economic mechanisms and land use patterns underlying overweight might be different between genders. Also, there is considerable variability within rural and urban areas. CONCLUSION: A complex geography of overweight is revealed. Small-scale studies, as well as methodological and data developments, are needed to deepen our understanding of this geography.
  • PublicationRestreint
    The geography of overweight in Quebec : analyzing and visualizing spatial inequalities using second-level residuals
    (Canadian Public Health Association, 2010-03-01) Thériault, Marius; Lebel, Alexandre; Riva, Mylène; Pampalon, Robert.
    Objective : To discuss critically the contribution of using second-level residuals from multilevel analyses to further the understanding of how place relates to health and to visualize areas, in the province of Quebec (Canada), with above- and below-average levels of overweight. Methods : Data on 20,449 individuals are from the Canadian Community Health Survey (CCHS Cycle 2.1) and were linked to 51 spatial units. Arealevel residuals were computed from a multilevel analysis examining individual and area characteristics associated with the risk of overweight. Mapping the area-level residuals indicates geographic areas where the risk of overweight is higher or lower compared to the provincial adjusted prevalence. Results : Controlling for socio-economic conditions and lifestyle, distinct spatial patterns of overweight were observed, indicating that the processes linking place to health may differ between men and women and between regional contexts. In some regions, the probability of overweight differed by 23% for men and 38% for women living in privileged conditions in comparison to the province’s adjusted prevalence of overweight. Conclusions : Analyzing and visualizing area-level residuals provides multi-scaled information that could enhance the understanding of the geographic distribution of overweight and has the potential to support more integrated and locally relevant interventions.
  • PublicationAccès libre
    Local context influence, activity space, and foodscape exposure in two canadian metropolitan settings : is daily mobility exposure associated with overweight?
    (Hindawi Publishing Corporation, 2011-12-28) Thériault, Marius; Kestens, Yan; Lebel, Alexandre; Pampalon, Robert.; Daniel, Mark; Subramanian, S.V.
    It has become increasingly common to attribute part of the obesity epidemic to changes in the environment. Identification of a clear and obvious role for contextual risk factors has not yet been demonstrated. The objectives of this study were to explain differences in local overweight risk in two different urban settings and to explore sex-specific associations with estimated mobility patterns. Overweight was modeled within a multilevel framework using built environmental and socioeconomic contextual indicators and individual-level estimates of activity space exposure to fast-food restaurants (or exposure to visited places). Significant variations in local levels in overweight risk were observed. Physical and socioeconomic contexts explained more area-level differences in overweight among men than among women and among inhabitants of Montreal than among inhabitants of Quebec City. Estimated activity space exposure to fast-food outlets was significantly associated with overweight for men in Montreal. Local-level analyses are required to improve our understanding of contextual influences on obesity, including multiple influences in people's daily geographies.