World of Tanks: Noobmeter.com's "OP Rating"

The statician(s) at noobmeter.com -- in late January -- blogged about a new measure he's been working on: OP Rating.  I.e., a rating to show which tanks are "OP."

Of note, the IS-6 and, _especially_, the KV-5 were near the top in tier 8 "HT" (Heavy Tank):

His words:
IS-6 and KV-5 performing very well, I think the gold ammo for credits has helped them as they lacked good guns. FCM 50t and VK4502A are both underperforming.  Here we also clearly see that M6A2E1 is owned by the best players - as it was a pre-order special so mostly players from the beta times got it.

blog.noobmeter.com

 LEVEL 8 Heavy Tank:

#	Tank	Nation	Battles	Tank WR	Player WR	OP rating
1	110	CH	3,441	56.7%	53.7%	1.06
2	IS-6	RU	43,640	49.7%	50.1%	0.99
3	KV-5	RU	75,339	50.5%	51.3%	0.98
4	T32	US	75,147	51.2%	52.4%	0.98
5	IS-3	RU	275,649	50.1%	51.4%	0.97
6	Caernarvon	UK	44,700	51.5%	52.9%	0.97
7	AMX 50 100	FR	40,620	51.5%	53.1%	0.97
8	T34	US	254,024	50.0%	52.0%	0.96
9	PzKpfw VIB Tiger II	DE	166,122	49.0%	51.0%	0.96
10	KV-4	RU	46,490	49.3%	51.3%	0.96
11	Löwe	DE	142,571	49.3%	51.3%	0.96
12	M6A2E1	US	921	53.5%	56.4%	0.95
13	VK 4502 (P) Ausf. A	DE	40,789	48.6%	51.4%	0.94
14	FCM 50t	FR	16,655	47.8%	50.8%	0.94