Mnemonic wrote on Apr 5
th, 2013 at 6:23pm:
Once again, you simply can't tell the difference between what you were talking about and what I was actually saying. I said nothing about the "quality of the education" not affecting the outcome. What I actually said was that if a public school student could achieve the same results as someone with private schooling, that made the benefits of private schooling redundant for that person. It was pointless to give hard-working and bright kids a private education because whatever gains and improvements would be insignificant. I said nothing about this being universal and applying to everyone. That's what you don't seem to be getting.
longweekend58 wrote on Apr 7
th, 2013 at 6:01pm:
your position is that a superior education gives a bright or hard-working student no benefit. That would be pretty hard to support given you have shown no evidence and it is illogical anyhow. I know there is this rather silly belief that private schools dont improve educational outcomes, however that is not supported by any evidence and in fact the contrary is more than proven.
I didn't actually say "no benefit." I said "insignificant." It's simple mathematics. If a person is already performing at 80% at a public school, the maximum improvement in performance when going to a private school is 20%. If their performance in a public school is 85%, the maximum possible improvement is 15%. If they perform at 90% in a public school, the maximum is 10%.
I could model this with a linear equation:
Let x = performance in public school (as percentage)
Let y = maximum possible improvement after going to private school (as percentage)
= maximum possible score (as percentage) - performance in public school (as percentage)
= 100 - x
As we go from considering worse performing students to better ones, the maximum possible improvement in going to a private school decreases at the same rate as indicated by the linear equation above (a gradient of -1). This is my "proof." There is no need for statistics and demographic data here because this is a simple mathematical relation.