Ken Bernstein, retired teacher, posted this comment:

“There are other issues that need to be included, even if there are no problems with erasures. States report scaled scores. They can and do change the conversion rate from raw to scaled in order to show “improvement” year to year. The year before I taught in Virginia the school in which I taught had a 58% pass rate on the Middle School American History test. The year I was there the pass rate was 81%, my own was 89%. Sounds great, right? Except they had lowered the cut score and changed the conversion. If the previous year’s raw scores had been converted using the same matrix, the score would have been 71% or so. Thus we showed “improvement” but not that much.”