A wagering game system and its operations are described herein. In some embodiments, the operations can include causing at least one event to occur during play of a wagering game. In some embodiments, the operations can further include determining a difference between occurrence of the at least one event and a theoretical expectation of occurrence associated with the at least one event. In some embodiments, the operations can further include computing a luck factor based on the difference. The luck factor represents luck for occurrence of the at least one event.
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