เปรียบเทียบวิธี

	Glottochronology (Lexical Dating)	ระเบียบวิธีเปรียบเทียบ
สาขาวิชา	ภาษาศาสตร์	ภาษาศาสตร์
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1952	1786
ผู้ริเริ่ม	Morris Swadesh	Sir William Jones
ประเภท	Estimation of time depth of language separation from cognate retention	Empirical process pipeline
แหล่งต้นตำรับ	Swadesh, M. (1955). Towards greater accuracy in lexicostatistic dating. International Journal of American Linguistics, 21(2), 121–137.	Hock, H. H. (1991). Principles of Historical Linguistics (2nd ed.). Berlin: Mouton de Gruyter.
ชื่อเรียกอื่น	Glottochronology, Lexicostatistic Dating, Linguistic Dating	Historical Comparative Linguistics, Genetic Linguistics
ที่เกี่ยวข้อง	4	4
สรุป	Glottochronology is Morris Swadesh's method for estimating the time depth at which two related languages separated, derived from the proportion of basic-vocabulary cognates they still share. Building directly on lexicostatistics, it adds a crucial extra assumption — a 'glottoclock' — that basic vocabulary is lost at an approximately constant rate over time, analogous to radioactive decay. Plugging the observed cognate proportion into a logarithmic decay formula yields an estimated separation date in years. The method is historically important but has been heavily criticized, and most historical linguists today treat its dates with great caution.	The Comparative Method is a foundational technique in historical linguistics for reconstructing ancestral languages and establishing genetic relationships between related languages. Pioneered by Sir William Jones in 1786, it systematically compares phonological, morphological, and lexical features across languages to identify regular sound correspondences and trace their shared origins. This method underpins modern historical linguistics and has been essential for understanding language families worldwide.