Vocabulary in the BIPA Book "Sahabatku Indonesia": A Corpus-Based Study

This research aims to describe a number of vocabulary words contained in the BIPA book "Sahabatku Indonesia" levels BIPA 1 to BIPA 7 published by Kemendikbudristek. This vocabulary list can later be used as a basis for compiling a BIPA dictionary or can be used as a learning medium for vocabulary that BIPA students must master. This research uses mixed methods, namely combining a quantitative approach and a qualitative approach by utilizing corpus linguistic research methods. The research data is in the form of vocabulary contained in the book BIPA Sahabatku Indonesia levels 1 to level 7 published by the Ministry of Education and Culture. Based on the results of research and analysis, it is known that (1) not all book levels experience an increase in vocabulary. The number of tokens and the number of dictions at each level do not show consistency; (2) the word class that appears most frequently is a noun; (3) the ten highest frequency vocabularies are conjunctions, prepositions, and pronouns; (4) the highest frequency vocabulary in the Sahabatku Indonesia book is similar to the general vocabulary of Indonesian, Sketch Engine Corpora, and Leipzig Corpora.