Is one of these statements correct for Gauss copula?
- For normal marginals Pearson correlation equal to Spearman correlation
- Pearson correlation is less or equal than Spearman correlation
copulacorrelationpearson-rspearman-rho
Is one of these statements correct for Gauss copula?
Best Answer
A dependence measure is a parameter of a Gauss copula. Let denote by $\rho$ the Pearson correlation, $\rho_s$ the Spearman correlation, and $\tau_k$ the Kendell tau.
It's known $\rho \in [-1,1]$, and $$\rho_s = \frac{6}{\pi}\cdot arcsin(\frac{\rho}{2}) ,$$ $$\tau_k = \frac{2}{\pi}\cdot arcsin(\rho).$$
In the plot below one can see the dependencies between $\rho_s$, $\tau_k$ and $\rho$.