Donald Kroodsma writes: Birdsong biologists interested in sexual selection and honest signalling have repeatedly reported confirmation, over more than a decade, of the biological significance of a scatterplot between trill rate and frequency bandwidth. This ‘performance hypothesis’ proposes that the closer a song plots to an upper bound on the graph, the more difficult the […] The post Bird fight! (Kroodsma vs. Podos) appeared first on Statistical Modeling, Causal Inference,…