MIXPAR: A Database of Mixed Perfective Auxiliation in Italo-Romance (v1.0). This is the first public release (v1.0) of the MIXPAR database, a large-scale dataset documenting auxiliary selection patterns in Italo-Romance dialects. The project focuses on mixed perfective paradigms—systems that alternate between essere (‘be’) and avere (‘have’) within the same TAM paradigm. The data is based on fieldwork and dialectal atlases and includes both structural pattern annotations and GPS-based geographic metadata, enabling advanced statistical and spatial modeling.

Three files are included: (1) MIXPAR-database-long-format_withGPS_September-2025.xlsx: full version of the database in long format with detailed linguistic and geographical annotations. (2) mixpar_for_R_final.csv: cleaned and pre-processed version optimized for statistical modeling in R. (3) patterns_with_gps.csv: summary of auxiliary patterns by location and TAM, enriched with geographic coordinates.