Explanation:
Mean dev: Average deviation in grade indices (positive = overestimate, negative = underestimate).
StdDev: Standard deviation of deviations (higher = more variance).
Exact: Number of exact matches (guessed grade equals true grade).
Played: Number of days the player participated / possible days.
Bias: Tendency to over- or underestimate.
Late avg pts: Average points scored from day 15 onward.