Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
This paper examines whether a measure of insider trading in betting markets derived from the Shin (1993) model is significantly related in samples of horse and greyhound races to an alternative, independently derived, indicator of insider activity suggested by Crafts (1985), namely plunges in the odds offered against a particular competitor on the day of a race. The analysis suggests that there is a significant relationship.