This is the part where edu-reactionaries will start to stare at their feet at start to mutter stories about how these differences must be all about the differences in motivation between parents. The random assignment studies have consistently demonstrated however that charter school students perform better on charter schools for inner city kids. The whole “motivated parents” question is irrelevant until such time that charter schools don’t have a waiting list in any case, unless of course you are willing to sacrifice the interests of children over those of adults.
Source: Jay P. Greene's Blog. Read full article. (link)