I have to say I prefer a college freshman's plot to yours, Andrew. Although, you did hack it together at 3am after strolling around Grant Park. And drawing the y axis from 0 is a mistake which you didn't make, too.
The Youth Vote: Freshman vs. Statistics Professor
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I agree--his plot is better! Age on the x-axis is good, but time is even better. I should remake my plot with all his plot's good features plus a few improvements (fixing the y-axis, removing the horizontal lines, and labeling the lines directly rather than with a color code). Also it would be good to use NES to take the lines back to earlier years.
P.S. He also posts a bar graph, which, as he notes, is horrible.
Interesting to think about the cohort effect missed by the binning...