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Here is my mistake, I think. $w_i$ can be written in terms of $p_i$ in the following way (note that $p_i$ can only assume two values, 0 and 1): $w_i (0) = w_0 + kb$ $w_i (1) = w_0 -c + (k-1)b$ where $w_0$ is the baseline fitness and $k$ is the number of altruists in the group (so, $k$ can be 0, 1, or 2). When we are calculating $\beta (w_i, p_i)$ the ...


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I am not sure I understood the question. Let me know if this helps. Case: N=2, freq=0.5 Let's assume that the frequency of those who cooperate is 0.5. The slope of the regression line (which R.squared is equal to 1 as we have as many data point than degrees of freedom) is by definition $\frac{\Delta w}{\Delta p}$. You defined $\Delta p = 1$. What is ...


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According to a theory proposed by Amotz Zahavi (formulator of the so called Handicap Principle), and others, sexual selection can be seen as a subtype of signal selection, which in it's turn is a subtype of natural selection. The well known example of a signal that is selected for is the tail of the peacock, which signals the high quality of it's owner. ...


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Generalities There are plenty of ways at looking at phenotypes that affect the fitness of the carrier and of other individuals. One of them is group selection and another one is kin selection. Those two concepts are just two different ways of looking at the same processes. Now let's consider only the kin selection way of looking at these processes. You can ...



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