This commentary presents a critique of a particular, strictly quantitative way of reviewing research findings within the field of land use and transportation studies, so-called meta-analyses. Beyond criticism raised earlier, the article draws attention to serious bias resulting when meta-analysis include studies encumbered with model specification error due to poor understanding of causal mechanisms. The article also discusses underestimated limitations due to neglect of differences between geographical contexts and inconsistent measurement of variables across studies. An example of an alternative approach is offered at the end of the article.
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