Now for the juicy stuff. In these "river plots", we see a relationship between high school math completion and students' socio-economic status (a composite measure of parental income, education, and job types).

Students with high SES are much more likely to complete more than 2 high school math classes, and have a much higher likelihood of completing calculus in high school. The sequences of courses leading to calculus appear to be similar across SES, but there are clear differences in the rates at which students of different SES levels complete math classes above Algebra II.
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