Set-piece attack share, free-kick outcomes, corner delivery quality, and big-chance conversion, summed from the teamstats aggregates in match_stats. Direct free-kick goals are isolated (attFreekickGoal), but goals from corners can't be split from goals off other set plays: the feed bundles them together as goalAssistSetplay. Regular season only. 2020 Island Games rows are flagged (~10 matches each) and team-season set-piece conversion rates are noisy because the numerator is only 4-7 goals per team per season. See methods for detail.