From: Multivariate distributions of correlated binary variables generated by pair-copulas
(Y1,Y2)
Probability
(0, 0)
C(q1,q2; θ)
(0, 1)
q1−C(q1,q2; θ)
(1, 0)
q2−C(q1,q2; θ)
(1, 1)
1−q1−q2+C(q1,q2; θ)