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Of course (though wheel reinvention can be super helpful educationally), but there are great free public R packages that interface to STAN (I use "rethinking" for my hierarchical Bayesian regression needs but I think Rstan would work, too), so going with someone's unnamed, private code isn't necessary imo. How much did the survey cost (was it a lot longer than the included google doc, then? e.g. Did you have screening questions to make sure people read the paragraph?). And model+mcmc specification can have lots of fiddly bits that can easily lead us astray, I'd say
Yeah, the survey was a lot longer. Typically general public surveys will cost over 10 dollars a complete, so getting 1200 cases for a survey like this can cost thousands of dollars.
I agree that model specification can be tricky, which is a reason I felt it well worth it to use the proprietary software I had access to that has been thoroughly vetted and code reviewed and is used frequently to run similar analyses rather than trying to construct my own.
I did not make sure people read the paragraph. I discussed the issue a bit in my discussion section, but one way a web survey might understate the effect is if people would pay closer attention and respond better to a friend delivering the message. OTOH, surveys do have some potentual vulnerability to the hawthorne effect, though that didn't seem to express itself in the donations question.
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