Here's a breakdown of the stats effects in game, but do note that the GM did away with the skill points.

Strength-Indicates the effectiveness of persona's physical attacks.

Magic-Indicates the effectiveness of the persona's magic skills.

Endurance-Indicates the effectiveness of the persona's defensive abilities.

Agility-affects a persona's hit and evasion rates.

Luck-Affects the possibillity of the persona performing critical hits and evading attacks.