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Has anyone ever told you that you can disagree with another person without taking an indignant and rude tone?

Actually SSRN is a preprint server, so this has not been peer reviewed.

I should have been more clear. By saying "I don't understand their methodology," I was hedging around the statement "their paper does not contain an adequate explanation of their methodology due to the nature of the complex systems they are modeling. By omitting information on how they constructed their controlling variables (and indeed the full scope of what variables they controlled for), the authors (perhaps inadvertently) cast doubt upon the conclusions they draw from their results."