2004b) “An Analysis of Multiple Interactivity Durations Using a Unifying Multivariate Hazard Model”, presented at the Transportation Research Board 83rd Annual Meeting

This paper jointly examines the length between successive participations in several activity purposes using a 1999 multi-week travel survey conducted in the German cities of Halle and Karlsruhe. A multivariate hazard model that accommodates a flexible duration dynamics structure, recognizes the effects of covariates, incorporates the variation in interactivity duration due to unobserved individual-specific factors and variation in interactivity duration within spells of the same individual, and considers the joint nature of participation in the various activities is proposed and applied. The variables considered in the analysis include demographics, access to the internet, location characteristics, and day of week variables