when did you last - I'm not sure people really do just focus on raw or value-added data when deciding which are the 'best' schools. Apologies for singling you out, camilamoran, but your earlier post sums this up quite well:
*A state school can never be as good as a private school. By definition, private schools have more money.
Comparing my daughter's school to the private school down the road, the private school has:
Smaller classes
Bigger playing fields
More attractive buildings
White peacocks wandering around the ground
In addition, if you can afford the private school, you are paying for your child to be in company with children whose families are as well off as you.
It is impossible for the state school to compete.*
Nothing there about data or performance, but instead a feeling that the private school must be better because of the playing fields, nice buildings, like-minded families, etc.