<p>I didn’t convert, they did:</p>
<p>"Here we compare average 2006 SAT scores (Math + Verbal) with re-centered 1966 SAT scores for the schools for which we could find 1966 data. The average difference is 16 points, a negligible amount. Breaking down differences by selectivity indicates that highly selective schools, on average, have seen modest improvements in student test scores (55 points) and non-selective schools have seen modest drops (33 points) for the schools examined here. Note that these are estimates of SAT scores based on Department of Education data. "</p>