Then there are references and samples over at sql server central (note reference is for T-SQL but is a good discussion about linear regression) : http://www.sqlservercentral.com/articles/T-SQL/69334/ but you have to "join" to get access.
Seems that there should be an article within EE - gives me an idea...
Mark Wills
Ummm... what do you mean by "flip chart" ? Are you working through a course or something ?
http://msdn.microsoft.com/en-us/library/ms174824(v=sql.105).aspx