Here is a graph showing how African-American 4th students have been doing over time in Washington DC public schools and charter schools. I have drawn a clear dividing line at year 2008, because the scores before that were under the influence of DC’s former school board and superintendents. After that time, DC has been under a chancellor answerable only to the mayor.
You may notice that the blue, black and purple lines separate after 2007. That’s because NAEP began reporting separate scores for DC’s regular public schools and for all publicly-supported schools, though not for the charter schools as a bloc. As a result, you have to do a little bit of linear algebra to calculate what the average scales were for the charter schools from 2009 onwards. (I used essentially the same equation that I did in the previous post. Please write me a note if you think I made an error.)
As usual, we can see that since the late 1990s and up until Rhee took over, the overall trend in all large cities, in the nation’s public schools, and in DC’s publicly-supported schools was upwards on this test. (Yes, I know, these are not scores that follow the same kids year after year, but for whatever reason, the group of kids answering these tests are in general getting more answers right every two years.) Before that, i.e. from 1992 to 1998, scores bounced around or went down.
After Rhee took over, those scores seem to have entered another bouncy period. In fact, in DCPS, the scores on this test in 2013 were only back up to the level of 2007. There is a clear demarcation between the scores in the charter schools (blue line) and the regular public schools. The line for the charter schools seems to follow the trend from 1998 to 2007.
If I knew nothing about the politics of EduDeform, I would wonder why the WaPo editorial board is claiming victory.