Roll-call data and ideological estimates from two consecutive constitutional bodies: The Chilean Constitutional...

We provide roll-call vote records, member-level metadata, and ideological position estimates for the 205 members of the two consecutive constitutional bodies elected in Chile between 2021 and 2023: the Constitutional Convention (July 2021-July 2022, n = 155) and the Constitutional Council (June-November 2023, n = 50). The two bodies produced 5919 plenary roll-call votes (4738 in the Convention and 1181 in the Council), covering all proposals, articles, and amendments voted on the floor of each assembly. We excluded procedural votes, votes on non-binding agreements, and votes on internal organizational matters. We estimated ideological positions independently within each body using three methods: the W-NOMINATE model; a Bayesian item-response theory model that produces posterior means and 95% credible intervals; and a dynamic model that tracks within-body ideological movement across four temporal periods. The two bodies were elected under distinct institutional rules: the Convention applied gender parity, seventeen reserved seats for indigenous peoples, and electoral rules that facilitated independent candidacies; the Council operated under party or coalition lists, with a single supernumerary indigenous seat allocated subject to a minimum vote threshold. The proposals drafted by each body were rejected in national plebiscites in September 2022 and December 2023. Member-level variables include political party, electoral pact, district or constituency, region, date of birth, sex, reserved-seat status, and a political-sector classification (Left, Center-Left, Center, Center-Right, or Right). These data can support comparative research on constitutional processes and analyses in political science, public policy, and institutional studies.