> it almost seems as if these were chosen retroactively to make the curve look the way it does. That's what regression does! And maybe they should've used regr

> it almost seems as if these were chosen retroactively to make the curve look the way it does. That's what regression does! And maybe they should've used regression, indeed. Instead, this looks more like an "improper linear model" http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.188.5825 http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.188.... -- something we see less and less of now that regression models are at our fingertips.