'Luck' is determined based on 'Winloss' and 'EV'.
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Generally, when 'Winloss' is less than 0 and 'EV' is more than 0, then 'Luck' is categorized as 'Bad Run', 'No Luck' or 'Worst Run'
If 'Winloss' is more than 0 and 'EV' is less than 0, then 'Luck' is categorized as 'Average', 'Lucky' or 'Very Lucky'.
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This summary is based on all-time game data for each specific game.