Figure 6.

Segmented regression model with one breakpoint that best fit observed and simulated data. Segmented regression on observed data from the Late MBS population (a) and the Early MBS population (b). (a) Late MBS population: the best model is a single line (breakpoint occurs at the generation 7 or later). (b) Early MBS population: the best model is provided by a breakpoint at generation 2 leading to a point at this generation and a line between the generations 3 to 7. Examples of segmented regression on simulations of the selection experiment (c to f). The selection experiment was simulated with the average initial heritability = 0.02841 estimated from the observed data of the Late MBS population with Model 2 (no input of de novo mutation see text for the details), and nP = 100 and nH = 60. The four examples were chosen among those that display the same average response to selection over the seven generations. (c) The best model is provided by a breakpoint at generation 4 leading to two segments, the first between generations 2 to 4 and the second between generations 5 to 7. (d to f) The best models are provided by a breakpoint at generation 3 leading to two segments, the first between generations 2 to 3 and the second between generations 4 to 7. In (f), the second segment is horizontal and corresponds to a plateau.

Durand et al. BMC Evolutionary Biology 2010 10:2   doi:10.1186/1471-2148-10-2
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