Dose Correlation of Danggui and Chuanxiong Drug Pairs in the Chinese Medicine Prescription Based on the Copula Function

Table 5

Squared Euclidean distance of the copula function of the irregular menstruation group.

Copula function	Squared Euclidean distance	Parameter estimation
Clayton copula function	0.1024	α = 3.4623
Frank copula function	0.0601	α = 10.7478
Gumbel copula function	0.0413	α = 3.0522
Gaussian copula function	0.0833	ρ = 0.0833
t-copula function	0.2005	ρ = 0.2005;