WORKING PAPER SERIES
13/9: A ZERO INFLATED REGRESSION MODEL FOR
Sarah Brown, Alan Duncan, Mark Harris,
Jennifer Roberts and Karl Taylor
This paper was written by researchers affiliated with the Bankwest Curtin Economics Centre (‘the Centre’). While every effort has been made to ensure the accuracy of this document, the uncertain nature of economic data, forecasting and analysis means that the Centre, Curtin University and/or Bankwest are unable to make any warranties in relation to the information contained herein. Any person who relies on the information contained in this document does so at their own risk. The Centre, Curtin University, Bankwest, and/or their employees and agents disclaim liability for any loss or damage, which may arise as a consequence of any person relying on the information contained in this document. Except where liability under any statute cannot be excluded, the Centre, Curtin University, Bankwest and/or their advisors, employees and officers do not accept any liability (whether under contract, tort or otherwise) for any resulting loss or damage suffered by the reader or by any other person.
The views in this publication are those of the authors and do not represent the views of Curtin University and/or
Bankwest or any of their affiliates. This publication is provided as general information only and does not consider anyone’s specific objectives, situation or needs. Neither the authors nor the Centre accept any duty of care or liability to anyone regarding this publication or any loss suffered in connection with the use of this publication or any of its content.
© Bankwest Curtin Economics Centre, October 2013
Bankwest Curtin Economics Centre Working Paper Series
Sarah Brown1, Alan Duncan2, Mark Harris2,3, Jennifer Roberts1 & Karl Taylor1
Department of Economics, University of Sheffield, United Kingdom
Bankwest Curtin Economics Centre, Curtin Business School, Australia
School of Economics and Finance, Curtin University, Australia
Brown, S., Duncan, A.S., Harris, M.N, Roberts, J. and Taylor, K. (2013), ‘A Zero Inflated Regression Model for Grouped Data’,
Bankwest Curtin Economics Centre Working Paper 13/9, Perth: Curtin University.
This publication contains confidential and propriety information of the Bankwest Curtin Economics Centre. All of the material in this publication is for your exclusive use and may not be otherwise used or modified for or by any other person or sold to or otherwise provided in whole or in part to any other person or entity without the prior written consent of the Bankwest Curtin Economics Centre.
For subscribers’ use only. NOT TO BE PHOTOCOPIED.
A standard hard copy or electronic subscription to this publication entitles employees of the same organisation and same physical location as the subscriber to the use of its contents for internal reporting purposes only. Multiple user licenses are available for organisations with more than one location.
A ZERO INFLATED REGRESSION MODEL
FOR GROUPED DATA
Sarah Brown1, Alan Duncan2, Mark Harris2,3, Jennifer Roberts1 and Karl Taylor1
of Economics, University of Sheffield, United Kingdom
Curtin Economics Centre (BCEC), Curtin Business School, Australia
of Economics and Finance, Curtin University, Australia
We introduce the (panel) zero-inflated interval regression (ZIIR) model, which is ideally suited when data are in the form of groups, which is commonly the case in survey data, and there is an ‘excess’ of zero observations. We apply our new modelling framework to the analysis of visits to general practitioners (GPs) using individual-level panel data from the British Household Panel Survey
(BHPS). The ZIIR model simultaneously estimates the…