I've seen something similar at our school. Even though my kids go to a public school, there is a lot of self-selection. Many people buy houses in the boundary area because the test scores say it is an "excellent" school and because it has a gifted program. We also have a large population of people who have choice enrolled their kids form outside the neighborhood for the same reasons. In short, people who want their kids to go to an "excellent" school based on test scores and/or who believe that their kids are gifted seek out our neighborhood and our school. Consequently, we have a population that is skewed differently from many of the surrounding schools.
