Table 5.

Aggregation of country relation index.

First-level indicators	Second-level indicators	Quantification	Aggregation
P	P1	P1∗ = ΣAt·(Σevent score × times of exchanges)	P = (P1∗ + P2∗ + P3∗)/3
	P2	P2∗ = ΣAt·(Σkeyword score × number of keywords)
	P3	P3∗ = ΣAt·(Σmultilateral event score/number of members)
E	E1	E1 = import/total import of the home country	E = (E1 + E2 + E3 + E4)/4
	E2	E2 = export/total export of the home country
	E3	E3 = FDI/total FDI of the home country
	E4	E4 = OFDI/total OFDI of the home country
S	S1	S1 = entry/total outbound of the host country	S = (S1 + S2)/2
	S2	S2 = exit/total outbound of the home country
R	P, E, S = dimension standardization		R +  = 0.4P + 0.4E + 0.2S
			R ∗  = [(1 + P)/2]0.4 × E0.4 × S0.2