How it's calculated?
Assist Ratio = (assists / (Field Goals Attempted + (0.44 * Free Throws Attempted) + Assists + Turnovers)) * 100

What does it mean?
Assist Ratio attempts to calculate the percentage of offensive possessions that result in an assist. It can be calculated for the whole team or a specific player. It attempts to evaluate a team or player's passing and decision-making abilities.