Exponential smoothing and non-negative data Muhammad Akram Department of Econometrics and Business Statistics, Monash University, VIC 3800, Australia. Email: Muhammad.Akram@buseco.monash.edu Rob J Hyndman Department of Econometrics and Business Statistics, Monash University, VIC 3800, Australia. Email: Rob.Hyndman@buseco.monash.edu J. Keith Ord McDonough School of Business, Georgetown University, Washington, DC20057. Email: ordk@georgetown.edu RPF Working Paper No. 2008-003 http://www.gwu.edu/~forcpgm/2008-003.pdf July 22, 2008 RESEARCH PROGRAM ON FORECASTING Center of Economic Research Department of Economics The George Washington University Washington, DC 20052 http://www.gwu.edu/~forcpgm Research Program on Forecasting (RPF) Working Papers represent preliminary work circulated for comment and discussion. Please contact the author(s) before citing this paper in any publications. The views expressed in RPF Working Papers are solely those of the author(s) and do not necessarily represent the views of RPF or George Washington University.