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Following our critique, Chan et al. defend the approach used in their original paper. They reveal their “iterative strategy of SEM” (structural equation modelling), which they claim is “standard” (we show otherwise) and “required for the proper and most effective use of SEM” for hypothesis testing. However, publishing their detailed procedure exposes fundamental flaws: capitalizing on chance and violating...
In their recent paper published in Science (2016, 351, 1437–1439), Chan et al. analysed 137 montane gradients, concluding that they found a novel pattern—a negative relationship between mean elevational range size of species and daily temperature variation, which was claimed as empirical evidence for a novel macrophysiological principle (Gilchrist's hypothesis). This intriguing possibility was their...
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