Bernard,
There are different sources that do group rankings, the main difference is the classification of the group, for example in one system TOL might fall under a group called general construction, and in another system be under home builders, or a medical company might fall under a biotechnology group or under drug manufacturing/distribution. Investors Business Daily seems to keep the best data, but there is some of those where an odd stock shows up that I'd think fits a different group.
CBS Market watch keeps group data, that is free access, though some of their groups seem a bit off the wall and they do give the strong groups but over a short time period without a ranking as far as I know. Other than us, there is probably several free sources of data.
Sam
