Business School a university for the real world


16 September 2019

The School of Economics and Finance is hosting internal seminars, the Brown Bag Seminar Series, where faculty, PhD students and external guests are invited to present their ongoing work to the School. The seminars run for 1 hour and a light lunch is served. Staff and students are encouraged to have discussions following the presentations.


Dr Shamsunnahar Yasmin - QUT


Fractional Split Approach - A Parsimonious Econometric Framework


In solving different decision and outcome processes in our community, we often deal with multiple choices/outcomes across different attribute levels for the same observation unit of analysis. Examples of such multiple choice occasions or outcome processes could be – vehicle miles travelled accrued by different type of vehicles at a roadway segment level, commodity flows at the destination zones by originating production zones, crash counts at a zonal level by different severity levels, number of vehicles at a roadway segment level by different vehicle speed categories and amount of expenditure at a household level by different expenditure categories. For the same study unit, if such multiple choices/outcomes are available, it is possible that those are interconnected and hence are multivariate in nature. In traditional econometric framework, such dependencies are accommodated by employing multivariate modeling structures. In the traditional multivariate modeling approaches, the impact of exogenous variables is quantified through separate functions for different dimensions. The main interaction across different dimensions is sought through unobserved effects i.e. there is no interaction of observed effects across multiple dependent variables. While this might not be a limitation per se, it might be beneficial to evaluate the impact of exogenous variables in a framework that directly relates a single exogenous variable to all dependent variables simultaneously. Such specification is not feasible within the traditional univariate or multivariate modeling approaches. The fractional split approach provides an alternative framework toward achieving such an objective. In a fractional split approach, the proportions of overall contributions by different dimensions are examined. Thus, in this model, exogenous variables affect attribute proportions through a single equation allowing us to obtain a parsimonious specification of exogenous variable impacts. Application of this framework will be demonstrated from the perspective of economic and transport research domains.


16 September 2019 - 16 September 2019
12:00pm - 1:00pm
Gardens Point Campus, Z Block, Level 8
GP - Z808
Free to attend
QUT School of Economics and Finance
Yang Liu
07 3138 4016
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