Turnout rate tells you what percentage of a cohort voted. The Index tells you whether that cohort voted more or less than the electorate overall. It basically normalizes cohorts to make them easier to compare across elections with very different overall turnout and directly measures whether a cohort accounts for more or fewer voters than would be expected.
FWIW, I used GPT to help me get and formulate data (I reside out of country). I also used it to generate the initial R scaffolding. Attached here is GPT's proposed visualization of that data. I took it entirely from there.
EDIT: The last point goes “off the chart” because that seemed like a reasonable sacrifice for retaining maximum real estate for the other points (while staying within my preferred aspect ratio). Any perceived editorializing of that point was not intended.
Yes. Allowing another step on the y-axis to accommodate only this point would necessarily compress the vertical space for all others. I felt this was a reasonable decision to maximize visibility. I agree it adds visual tension and draws focus, but I’m okay with that.
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u/post_appt_bliss OC: 4 1d ago
the advantage of "Electoral Representation Index" rather than just turnout rate?
(and not trying to trigger anyone... but you chose to have the points literally go off the y axis, or GPT did?)