Are the Numbers of Motorbike in Use in Japan over-Evaluated ? Statistics on Stock-Flow Balance of Motorbike in Japan Revisited

Abstract

This paper examines the possibility that the numbers of motorbike in use in Japan are overevaluated by investigating the consistency between data on stock and flow of motorbike in Japan. Several datasets on stock, including official registration, automobile tax, automobile liability insurance, household survey, are compared and analyzed. As a result, official stock data of motorbike type without automobile inspection are over-evaluated, whereas the one with automobile inspection is found to be difficult to be concluded for conflicting data considered in this study.