Most studies on the matter involved comparing performance in the "clutch" category of statistics (production with runners in scoring position, performance late in close games, etc.) between seasons; if clutch hitting were an actual skill, it would follow that the same players would do well in the clutch statistics year in and year out (the correlation coefficient between players' performances over multiple seasons would be high). Cramer's study was the first of its kind, and it found that clutch hitting numbers between seasons for the same player varied wildly; in fact, the variance was the kind one would expect if the numbers had been selected randomly. Since Cramer published his results, many others have tried to find some evidence that clutch hitting is a skill, but almost every study has confirmed Cramer's initial findings: that "clutch hitting," in terms of certain players being able to "rise to the occasion" under pressure, is an illusion.