To quote the study, the walkscore.com data is "the earning records from all American citizens born between 1980 and 1982 whose parents filed taxes." Your use of the number 382 seems to be rhetorical implying that the sample isn't large enough. Moreover, your use of "buy/beg" verges on a predicative sort of ad hominem. Your criticism are totally valid, but you missed the most egregious flaw: "[O]ur analyses treat walkability and access to public transportation as interchangeable."