Strategic Rivalries Data, 1816-2020战略对抗数据集，1816-2020

Strategic Rivalries Data (1494‑2020) identifies state‑pair strategic rivalries: pairs of states mutually perceiving each other as competitive threatening enemies. Original unit is dyad‑spell (continuous rivalry episode); transformed to dyad‑year panel. Dummy variables mark rivalry types: positional, spatial, ideological, interventionary, plus symmetric/asymmetric principal rivalries. Final observation year:2020.

战略对抗数据集1494‑2020识别国家对之间的战略对抗关系：双方决策者互相将对方视作有竞争、有军事威胁的敌人。原始数据为dyad‑spell（对抗持续片段），本处理脚本转换为dyad‑year年度面板。虚拟变量标记对抗类型：地位型、领土型、意识形态型、干涉型，同时标记对称/非对称首要对抗。数据最后观测年份2020。