小学校国語教科書に掲載されている単語の種類数と出現頻度

抄録

The purpose of this study is to extract an exhaustive list of words from the sentences printed in Japanese language textbooks used in elementary schools in Japan,and to investigate the number and frequency of occurrence of these words in Japanese language education. Morphological analysis software was used to extract the words. As a result,13,341

kinds of words written in hiragana, katakana, and/or kanji were extracted from the printed letters published in elementary school textbooks. We counted the number of nouns, verbs, adjectives, formal verbs, and adverbs, and reported their frequencies in each part of speech. The accuracy of our morpheme analysis was lowest in the first-grade textbook,which was written in hiragana for the most part,due to the small number of kyoiku kanji. Comparison between this research and previous research showed that the proportion of common words in verbs and adjectives was as high as 70%or more,while it was relatively low in nouns. We have also discussed the problems related to the accuracy of morpheme analysis for sentences in elementary school language textbooks,the properties of the extracted words,and the differences from the words reported in previous studies.