In comparable groups of children diagnosed with autism by age four, the median age at initial evaluation was 27 months for children born in 2006 versus 32 months for those born in 2002. (sciencedaily.com)
In places like Cambridge, Massachusetts, which uses choice to achieve economic diversity in its schools, graduation rates for low - income, Black and Hispanic students are as much as 20 percentage points higher than for comparable groups in nearby Boston. (volumeandlightnashville.org)
We find that randomization does ensure comparable groups in grades at which quite a few students are admitted. (educationnext.org)