Explain this to me

This table contains stats for heroes' picks and bans.
Rank is used to sort heroes by winrate, taking number of their picks and bans into account. Higher rank means the hero is stronger. Rev-Rank (Reverse Rank) is used to show the least effective heroes with the most number of matches.
Number of bans is calculated approximately based on ratio of matches on the position to all matches of the hero.
Balance metric estimates how balanced the meta is (0 to 100)

Median hero picks (mp): 1 - Median hero bans (mb): 1 - Matches: 3

Remove low picks (0.9mp) Remove low bans (0.9mb)

Balance rank	Winrate	Pickrate	Contest Rate
25.0	50.0	0.0	0.0

Hero	Position	Matches	Contest Rate	Rank	Rev-Rank	Picked	Winrate	mp	Banned	Winrate	mb
Abaddon	Core Offlane	3	100.00%	100.00	3.85	1	100.00%	1.0	2	100.00%	2.0
Riki	Core Midlane	2	66.67%	96.15	26.92	1	100.00%	1.0	1	100.00%	1.0
Ember Spirit	Core Midlane	3	100.00%	92.31	46.15	1	100.00%	1.0	2	50.00%	2.0
Brewmaster	Support Offlane	3	100.00%	88.46	50.00	1	100.00%	1.0	2	50.00%	2.0
Grimstroke	Core Safelane	1	33.33%	84.62	7.69	1	100.00%	1.0	0	0.00%	0.0
Nyx Assassin	Support Offlane	1	33.33%	80.77	15.38	1	100.00%	1.0	0	0.00%	0.0
Grimstroke	Support Offlane	1	33.33%	80.77	15.38	1	100.00%	1.0	0	0.00%	0.0
Grimstroke	Support Safelane	1	33.33%	73.08	19.23	1	100.00%	1.0	0	0.00%	0.0
Bounty Hunter	Core Offlane	1	33.33%	69.23	23.08	1	100.00%	1.0	0	0.00%	0.0
Troll Warlord	Core Safelane	2	66.67%	65.38	30.77	1	100.00%	1.0	1	0.00%	1.0
Troll Warlord	Core Offlane	2	66.67%	61.54	34.62	1	100.00%	1.0	1	0.00%	1.0
Batrider	Core Midlane	2	66.67%	57.69	38.46	1	100.00%	1.0	1	0.00%	1.0
Batrider	Core Safelane	2	66.67%	53.85	42.31	1	100.00%	1.0	1	0.00%	1.0
Earth Spirit	Support Offlane	2	66.67%	50.00	53.85	2	50.00%	2.0	0	0.00%	0.0
Elder Titan	Support Safelane	2	66.67%	46.15	57.69	2	50.00%	2.0	0	0.00%	0.0
Morphling	Core Midlane	3	100.00%	42.31	92.31	1	0.00%	1.0	2	50.00%	2.0
Night Stalker	Core Safelane	2	66.67%	38.46	65.38	1	0.00%	1.0	1	100.00%	1.0
Lycan	Core Safelane	2	66.67%	38.46	65.38	1	0.00%	1.0	1	100.00%	1.0
Windranger	Core Midlane	1	33.33%	30.77	73.08	1	0.00%	1.0	0	0.00%	0.0
Arc Warden	Core Midlane	1	33.33%	30.77	73.08	1	0.00%	1.0	0	0.00%	0.0
Venomancer	Core Offlane	1	33.33%	23.08	76.92	1	0.00%	1.0	0	0.00%	0.0
Weaver	Core Safelane	1	33.33%	19.23	80.77	1	0.00%	1.0	0	0.00%	0.0
Sand King	Core Offlane	2	66.67%	15.38	96.15	2	0.00%	2.0	0	0.00%	0.0
Mirana	Support Offlane	3	100.00%	11.54	100.00	2	0.00%	2.0	1	0.00%	1.0
Enchantress	Support Offlane	1	33.33%	7.69	84.62	1	0.00%	1.0	0	0.00%	0.0
Clockwerk	Support Offlane	1	33.33%	7.69	92.31	1	0.00%	1.0	0	0.00%	0.0