[olau]

There is of course self-selection compared to going with the default, but your data may be poisoned.

I don't know the Montessori system, but in the Waldorf system, some of the intellectual stuff is moved from the first years to the later years compared to the public school. So if you compare midway on the public school metric, you'll find a gap.

Of course, if you compared midway on a Waldorf metric, you'll find that students from those public schools have a gap in the other direction.

I talked to a Waldorf school principal about this, and she said that if you enter the system at later grades, say halfway through, they could see that there are some things that such a child just don't learn.