We develop evidence of bettors with sentiment bias in the betting market on National Basketball Association (NBA) games. We use novel measures of team popularity, arena capacity-utilization and team all star votes received, as proxies for the presence of biased investors. Analysis of point...

Previous research using attendance-based proxies for the number of investors with sentiment bias supported the presence of investor sentiment in sports betting markets. We use data from social media (Facebook \Likes") to proxy for participants with investor sentiment and analyze variation in...