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40
It's alleged that the number of people donating zero is large, and more generally I would expect people to round off their donation amounts when reporting. Ages are clearly also quantized. So there may be lots of points on top of one another. Is it easy to jitter them in the plot, or something like that, to avoid this source of visual confusion?
20
Apply jitter() inside of qplot. Also, transparency:
qplot(jitter(Age), jitter(CharityLog,a=0.1), color=EffectiveAltruism, data=survey,alpha=I(0.5))
Default jitter() worked great on Age, but was negligible on CharityLog.
3
Just eyeballing the charts without any jitter, it kinda looks like Effective Altruists more often report precise donation quantities, while non-EAs round things off in standard ways, producing dramatic orange lines perpendicular to the Y axis and more of a cloud for the blues. Not sure what to make of this, even if true.
http://www.gwern.net/EA%20donations