I'll try my best:
Aim is based off of two factors, HS% and K/D, scaled 60/40.
Clutch is based off of two factors, Clutches per Round and Clutch%, scaled 50/50.
Support is based off of Assists per Round.
Fragging is based off of ACS and KPR, scaled 50/50.
Entry is based off of FKPR and FK/FD, scaled 80/20.
Consistency is based off of K/D and KAST%, scaled 60/40.
For each stat, a player gets a rating out of roughly 100 (some exceed 100) based on z-scoring. The average player has around a rating of 70-75. The distribution is slightly different in some stats so the exact formula for each is variable, but for instance, assists per round is calculated by (73 + 12 * ((APR - 0.2876978417) / 0.09682927435) ), where the last 2 numbers are the mean and standard deviation, respectively.
Finally, a player's overall rating is slightly adjusted between roles. For example, an Initiator is weighed 10% Aim, 10% Clutch, 35% Support, 20% Fragging, 5% Entry, and 20% Consistency. On the other hand, a Duelist is weighed at 20% Aim, 10% Clutch, 5% Support, 30% Fragging, 20% Entry, and 15% Consistency.