From: The role of sexual preferences in intrasexual female competition
Males | |||||
---|---|---|---|---|---|
x1 | x2 | x3 | x4 | ||
Females | x1 | $\frac{\text{\alpha}\left({\text{x}}_{1}{\text{x}}_{1}\right)}{Z}$ | $\frac{\left({\text{x}}_{1}{\text{x}}_{2}\right)}{Z}$ | $\frac{\text{\alpha}\left({\text{x}}_{1}\text{x}3\right)}{Z}$ | $\frac{\left({\text{x}}_{1}{\text{x}}_{4}\right)}{Z}$ |
x2 | $\frac{\text{\alpha}\left({\text{x}}_{2}{\text{x}}_{1}\right)}{Z}$ | $\frac{\left({\text{x}}_{2}{\text{x}}_{2}\right)}{Z}$ | $\frac{\text{\alpha}\left({\text{x}}_{2}{\text{x}}_{3}\right)}{Z}$ | $\frac{\left({\text{x}}_{2}{\text{x}}_{4}\right)}{Z}$ | |
x3 | x_{3}x_{1} | x_{3}x_{2} | x_{3}x_{3} | x_{3}x_{4} | |
x4 | x_{4}x_{1} | x_{4}x_{2} | x_{4}x_{3} | x_{4}x_{4} | |
Z = α(x_{1} + x_{3}) + x_{2} + x_{4} |