This post has been removed 10 October 2013 due to concern that it is being plagiarised.
Update March 2018: The article is available instead 'Further Analysis 1894 – 2016':
http://grandprixratings.blogspot.com/2018/03/patrick-obriens-grand-prix-rating.html
"He was a mine of accurate information and his book is a respected and valued part of my racing library." ~ Stirling Moss, OBE. *** “Patrick O’Brien’s system is the most objective I’ve seen to date.” ~ Peter Windsor. *** "He probably pushed F1 metrics forward further than anybody else has ever done and his contribution will not be forgotten." ~ PF1 forum. *** "His rating system [...] brought some kind of consistent view of F1 throughout the decades and offered me a lot of insight." ~ PF1 forum.