Finally we have clear evidence of what school choice advocates like myself have been saying for years, namely that competition in public education will raise academic achievement for all students. A study reported today in the Wall Street Journal completed by the Manhattan Institute's Marcus Winters looked at New York City students in grades 3 through 8 found that "for every one percent of a public school's students who leave for a charter reading proficiency among those who remain increases by about 0.02 standard deviations."
Mr. Winters also has good news for the lowest performing students in traditional schools, who are often minorities, in that he found that charter completion helps boost their standardized test scores in both reading in math.
Therefore, an argument can now be made that the rise in DC CAS scores that Miss Rhee claimed was due to her work was really a result of charter competition.