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

Table 7

Squared Euclidean distance of the copula function of the stroke group.

Copula function	Squared Euclidean distance	Parameter estimation
Clayton copula function	0.0362	α = 6.0456
Frank copula function	0.0116	α = 18.3760
Gumbel copula function	0.0099	α = 4.4580
Gaussian copula function	0.0353	ρ = 0.8914
t-copula function	0.0141	ρ = 0.9512;