This paper analyzes influence of an additional referee on number of fouls by using the data from Women's Japan Basketball League (WJBL) in order to examine whether number of police officers affects the crime rate. For the season of 2010-2011, the upper league of the WJBL introduced 3 referees...

This paper examines the effect of unemployment rates on crime rates, using two types of Japanese data: time-series data from 1976 to 2008 and prefectural panel data from 1975 to 2005. An analysis using time-series data shows that an increase in unemployment rates raises crime rates, while the...