The remaining subscales have increased in breadth of domain by agglomeration over time. The comparison presented here should therefore be treated as illustrative only. We chose not to analyze student performance against these standards. The single mathematics measure is analogous to the mathematics power score currently reported to schools for the Kansas Assessment. There is another parameter of interest.
Some regression lines fit their data points closely, others loosely.
The slope coefficient for lines that fit tightly carries a stronger meaning than if the line fits loosely. In other work on other data sets, we have been examining this issue more closely. For this study, variation in the goodness of fit does not have much consequence. Relevant measures include suspensions and expulsions, criminal violations, dropping out, advanced courses in math or science, and placement after graduation. Most speak only to high school issues.