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Mielke’s Beta-Kappa Distribution

A generalized F distribution. Two shape parameters $\kappa$ and $\theta$ , and $x>0$ . The $\beta$ in the DATAPLOT reference is a scale parameter.

$$\begin{eqnarray*} f\left(x;\kappa,\theta\right) & = & \frac{\kappa x^{\kappa-1}}{\left(1+x^{\theta}\right)^{1+\frac{\kappa}{\theta}}}\\ F\left(x;\kappa,\theta\right) & = & \frac{x^{\kappa}}{\left(1+x^{\theta}\right)^{\kappa/\theta}}\\ G\left(q;\kappa,\theta\right) & = & \left(\frac{q^{\theta/\kappa}}{1-q^{\theta/\kappa}}\right)^{1/\theta}\end{eqnarray*}$$

Implementation: scipy.stats.mielke