I was wrong
Last week, teaching my statistics class, I gave an example of regression using actual data. I had hypothesized that given the greater discrimination and poverty on the reservation 40 or 50 years ago, there would be a negative relationship between age and educational attainment within the adult population. That is, people over 60 would be less likely to have obtained a high school diploma, associate’s degree or bachelor’s degree than those under 40.. . .