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Linguistic demography is the statistical study of languages among all populations. Estimating the number of speakers of a given language is not straightforward, and various estimates may diverge considerably. This is first of all due to the question of defining "language" vs. "dialect". Identification of varieties as a single language or as distinct languages is often based on ethnic, cultural, or political considerations rather than mutual intelligibility. The second difficulty is multilingualism, complicating the definition of "native language". Finally, in many countries, insufficient census data add to the difficulties. Demolinguistics is a branch of Sociology of language observing linguistic trends as affected by population distribution and redistribution and by the status of societies. ==Most spoken languages== The following table compares the estimates of Comrie (1998) and Weber (1997)〔Bernard Comrie, Encarta Encyclopedia (1998); George Weber “Top Languages: The World’s 10 Most Influential Languages” in Language Today (Vol. 2, Dec 1997)()〕 (number of native speakers in millions). Also given are the estimates of SIL Ethnologue (2005). Comparing estimates that do not date to the same year is problematic due to the 1.14% per year growth of world population (with significant regional differences). This table shows that for the world's largest languages, it is impossible to give an estimate of the number of native speakers with a certainty better than 10% or so. Diverse but ethnically unified languages like Chinese and Arabic are particularly difficult to define, and estimates consequently show uncertainties of the order of 25%. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Linguistic demography」の詳細全文を読む スポンサード リンク
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