The BEST Dataset of Language Proficiency

The BEST dataset presents data from 650 adult participants from the Basque Country who completed a series of Basque, English, and Spanish language proficiency tests (hence the name BEST). The BEST dataset is the result of a collaborative project developed at the Basque Center on Cognition, Brain and Language (BCBL) with the aim of providing researchers from the Basque Country with a series of norms that can be used to characterize the test samples. files contain background information about the participants (age, gender, maximum education level, and handedness). It furthermore contains the values per language for age of acquisition, self-rated exposure, self-rated proficiency, the scores resulting from an interview, the number of correctly named items in a picture-naming test, and the LexTALE scores.