Educational systems in the United States are generating vast amounts of data on student achievement. This may provide researchers and policy makers with long sought-after insight on the factors explaining student performance. This study uses recent data from Washington 10th graders to examine why some students learned more math than others.…

This year the Center on Education Policy analyzed data on the achievement of different groups of students in two distinct ways. First, it looked at grade 4 test results to determine whether the performance of various groups improved at three achievement levels--basic and above, proficient and above, and advanced. Second, it looked at gaps between…