ABSTRACT
Demolinguistic data are, by their very nature, demographic and linguistic. In general, these refer to the number of speakers and learners of a language, the number of births and deaths among the members of different linguistic groups, the composition of households and families in their linguistic dimensions, the number and profile of members of all kinds of groups and associations, and the number of immigrants and emigrants of each linguistic group with respect to the communities of origin and destination. The three most relevant and useful sources for demolinguistics are administrative records, censuses, and surveys. Registries and censuses, created by administrative authorities, offer fundamental information for the study of the demography of languages, given that they pay attention to the composition, distribution, and dynamics of populations. There are also strictly demolinguistic censuses, but they are rare and not always transparent. Surveys, for their part, are mechanisms of data collection that are more specific and agile, due to their lower complexity and cost. Among these, within our field, it is worth highlighting those that aim to determine the use of languages by domain and those on the subjective vitality of minority languages.
