Competitive landscape

Parity & Concentration

Transparent descriptive measures of repeat winners and title concentration. Athletic and activity categories are identified explicitly and are never compared as though they were the same competition format.

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Parity and championship concentration by category, sport or activity, and decade

Athletic	Outdoor Track	2010s	139	47	66.2%	30.9%	0.036	0.964
Athletic	Basketball	2010s	137	69	49.6%	20.4%	0.022	0.978
Athletic	Golf	2010s	137	48	65.0%	32.8%	0.036	0.964
Athletic	Tennis	2010s	119	31	73.9%	53.8%	0.076	0.924
Athletic	Cross Country	2010s	117	35	70.1%	37.6%	0.047	0.953
Athletic	Outdoor Track	2000s	115	45	60.9%	26.1%	0.031	0.969
Athletic	Basketball	2000s	112	70	37.5%	21.4%	0.021	0.979
Athletic	Tennis	2000s	111	37	66.7%	49.5%	0.067	0.933
Athletic	Outdoor Track	1980s	109	45	58.7%	40.4%	0.048	0.952
Athletic	Basketball	1980s	104	67	35.6%	18.3%	0.020	0.980
Athletic	Outdoor Track	1990s	101	44	56.4%	29.7%	0.035	0.965
Athletic	Basketball	1990s	100	68	32.0%	17.0%	0.019	0.981
Athletic	Golf	2000s	97	41	57.7%	34.0%	0.042	0.958
Athletic	Cross Country	2000s	96	29	69.8%	37.5%	0.052	0.948
Athletic	Basketball	2020s	92	57	38.0%	22.8%	0.024	0.976
Athletic	Tennis	1990s	88	39	55.7%	37.5%	0.051	0.949
Athletic	Basketball	1970s	80	48	40.0%	27.5%	0.033	0.967
Athletic	Soccer	2010s	80	25	68.8%	47.5%	0.066	0.934
Athletic	Tennis	1980s	80	31	61.3%	37.5%	0.047	0.953
Athletic	Outdoor Track	1970s	74	41	44.6%	29.7%	0.035	0.965
Athletic	Outdoor Track	2020s	73	33	54.8%	37.0%	0.048	0.952
Athletic	Golf	2020s	72	35	51.4%	30.6%	0.041	0.959
Athletic	Cross Country	2020s	72	27	62.5%	48.6%	0.066	0.934
Activity	Quiz Bowl	2010s	70	32	54.3%	32.9%	0.043	0.957
Athletic	Baseball	2010s	69	44	36.2%	27.5%	0.032	0.968