"You seem to have an axe to grind. I'm curious as to what it is."
Why don't you just say what you think it is - I've stated my position, I'm curious as to why you wouldn't take me at face value?
"The 30-point differential, in many cases, is not unrealistic. I have 2 kids who have demonstrated this VERY clearly (having started out in private and/or public schools, then progressed into homeschooling)."
Remember, 30 points is an AVERAGE (it could be much more). But you are comparing your individual kids to the entire population of public school kids - not much point.
That stat serves no purpose than to make homeschooling parents feel good - which is fine, but accept it for what it is.
I'm not sure why I see so much hostility to homeschooling statistics in your posts, else I wouldn't have asked.
It's interesting that you say I shouldn't compare my individual kids to a population in the public schools. Following that dictum, no comparison could ever be made, statistically or otherwise. Anecdotal evidence in support of statistical analysis is valid. Anecdotal evidence by itself, of course, is commonly specious.