Afinidades Elegidas: Parliamentary Cosponsorship Networks of the Spanish Second Republic (1931-1939)

This dataset contains the primary data and derived metrics from the parliamentary co-authorship network of the Spanish Second Republic (1931–1939), constructed from the Diarios de Sesiones del Congreso de los Diputados (Official Record of Parliamentary Debates). The network connects the 1,026 deputies who served across the three constitutional legislatures (1931–1933, 1933–1936, 1936–1939) through edges representing the joint signing of legislative measures: bills, amendments, collective petitions, interpellations, and other parliamentary initiatives. Edge weight equals the number of measures co-signed by each deputy pair. The dataset includes: (1) the complete record of individual co-authorships (94,621 records); (2) political and territorial metadata for the 1,446 unique deputy-legislature pairs;(3) the network edge list (63,508 co-authoring pairs); (4) social network analysis metrics for each deputy per legislature and for the full period, including centralities, Guimerà-Amaral indicators, ego-network metrics, behavioural profiles, a six-category structural role taxonomy, inter-party proximity matrices, and aggregate party statistics; and (5) a lightweight structural role index for use in visualisations. This is the first systematic reconstruction of the legislative collaboration networks of the Spanish Second Republic. The dataset is an autonomous sub-product of the Luz y Taquígrafos corpus (DOI: 10.7910/DVN/THQCMI).