Efficiency, WN7, VE. What are these ratings?
April 18, 2013 at 8:45 AM
I get a lot of questions on what these ratings are all about (which I find surprising as I thought most people who use my site would be into stats and know at least what Efficiency Rating is). Generally speaking, they are attempts at quantifying the skill level of a player.
The Efficiency Rating (ER) probably was the first of these that was widely adopted. I believe it was derived by the people who created XVM (before I ever started playing this game so not certain of the history). It was basically the de facto metric of player skill for a long time. The general consensus over time was that it gave too much weight to capture points and can be inflated by capturing the enemy base when this action had no real effect on outcome of the battle. After WN began gaining popularity, ER was modified to reduce the weight of capture points. The discussions on Efficiency Rating can be found here, in Russian http://www.koreanrandom.com/forum/topic/2625-xvm-%D1%88%D0%BA%D0%B0%D0%BB%D0%B0-scale/.
WN Rating was originally created by Praetor77 from the NA server. WN Rating makes use of statistical analysis to try to create a formula that is more reflective of player skill. Its biggest difference to ER is the removal of the capture point component completely and replaces it with a component related to wins. It has gone through various iterations with contributions from many players who engage in discussions on this topic in the WOT forums. The current version is WN7, where a component was added as a penalty to "seal clubbers", players who pad their stats by playing large number of games at lower tiers. WN7 has gained support from many players and was added into XVM (although the developers of XVM decided to come up with their own little spin on it by scaling it from 0-100). Details of WN7 can be found here http://forum.worldoftanks.com/index.php?/topic/184017-wn7-what-is-it-and-how-does-it-work/.
VE Rating was created by VaporGator from the NA server. This is probably the least known of the three ratings supported by my site. It basically is a metric for damage output by average tier played. A multiplier was included to give it a scale somewhat similar to WN and ER. Details can be found here http://forum.worldoftanks.com/index.php?/topic/196422-ve-wn4-pr-and-se-rating-metrics-compared-with-results.
IMHO, there is no one metric that tells the whole story of a player's skill. To know how well someone plays, you need to look at all of their stats from their in-game dossier. As Wargaming does not provide all of the dossier stats in a way that is accessible to sites like mine, whatever rating used probably will not be able to provide a complete picture. Even the dossier is not perfect, as it does not contain spotting damage, which is a key stat for good light tank players.
Personally, I do not engage in ratings discussions. Other sites such as Noobmeter has come up with its own rating (PR) and Wotlabs also tried something as well. I will not be doing such a thing. The point of my site is just to track stats, not to give my own interpretation of them.