I suppose I shouldn’t read too much into this. From NPR:
On Monday we told you about the first day of school in New Orleans, where most of the schools are now charter schools. In our story we said that even though test scores are up, 80 percent of schools still received a D or F grades from the state of Louisiana. Well, that percentage is incorrect. Only about 20 percent of the charter schools in New Orleans have D’s or F’s. More than half of the schools have grades of A, B or C. The rest were not graded. We’re sorry about the error.
The original story from Monday, 8/11, on the first day of school in New Orleans, is here. (The story also notes the correction.)