2/ First, here is the original image from @pewresearch (and link: https://www.people-press.org/2017/10/05/1-partisan-divides-over-political-values-widen/ …).pic.twitter.com/NLXkLrMKib
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2/ First, here is the original image from @pewresearch (and link: https://www.people-press.org/2017/10/05/1-partisan-divides-over-political-values-widen/ …).pic.twitter.com/NLXkLrMKib
3/ So, yes, the first one is manipulated to stack 1994 on top of 2017, inviting the viewer to compare the median lines and conclude, "the Democrats are the extremists!" Except...what is this a distribution of?
4/ A "10-item scale of political values." But, that's lost in the dimensionality reduction presented as a density plot... ...conditioned by party ID. https://www.people-press.org/2017/10/05/1-partisan-divides-over-political-values-widen/1_1-18/ …pic.twitter.com/WKuXPGQgTb
5/ None of the underlying questions are apparent from the partisan scale. Neither is history. It just looks like, "this objective measure of political positions says the Democrats moved more than the Republicans, so they must be the extreme ones."
6/ That's an extremely common way to make bad arguments convenient (e.g. the Dow isn't the economy). Granted Pew's audience isn't this broad and I don't think you can prevent bad-faith usage of stuff like this.
7/ But again, I'm just getting wary of communicating this way -- especially to a popular audience -- because it obscures so much and invites evaluation of identity alone, rather than the underlying responses that noisily proxy for values themselves. [end of thinking out loud]
The whole thread was great but this comment right here 

really speaks to me
@pewresearch any chance this could be put on @github or am I overlooking it? https://github.com/pewresearch?tab=repositories …
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