Fig. 6

Comparison with binomial distribution. The solid lines represent binomial distributions \(\mathrm {B}(n,p_{\alpha })\), where \(p_{\alpha }\) is the conditional probability that we can choose the overlapped edge between drug pipeline layer and the \(\alpha\)-th layer from n edges for a for supply chain and b ownership. The dashed lines represent observed values listed in Table 5, that is, 480 for \(\alpha =2\) and 22 for \(\alpha =3\)