– When the authors use the new test scores, they find that variance is substantial at the start of kindergarten and does not grow but actually shrinks over the next two to three years. This finding, which was not evident in the original Great Equalizer
study, implicates the years before kindergarten as the primary source of inequality in elementary reading and math.
– Total score variance grows during most summers and shrinks during most school years, suggesting that schools reduce inequality overall.
– Changes in inequality are small after kindergarten and do not replicate consistently across grades, subjects, or cohorts. That said, socioeconomic gaps tend to shrink during the school year and grow during the summer, while the black-white gap tends to follow the opposite pattern.
– Socioeconomic gaps tend to shrink during the school year and grow during the summer, while the black-white gap tends to follow the opposite pattern.
– Inequality in basic reading and math skill originates mainly in early childhood, before kindergarten begins.