express_coef_gumb: Gumbel coefficient for Kendall's tau formula
Description
The function is used internally in liouv.Tau.
Usage
express_coef_gumb(index_k, index_l, theta, a)
Arguments
- index_k
first index
- index_l
second index
- theta
parameter of the corresponding Archimedean copula
- a
sum of alphavec