Ok, let me set this little lady who did this analysis straight. The courses in general that Tiger competes on are harder. Does anyone want to argue that Augusta, TPC, Oakmont, Carnoustie, and Southern Hills (last years major venues) are harder than say Waialae, TPC Sugarloaf, Scottsdale, Deere Run and Brown Deer Park? I would say that those courses are far easier than the others mentioned. Tiger plays on tougher courses, it goes without saying the stroke average will be higher at the events he plays.