Publication and scholarly productivity in the field of Japanese literature

The purpose of this paper is to clarify the relation between the scholarly productivity and types of publications (books and articles). About 200 researchers of Japanese Literature, their publication records and seven factors (age, prestige of graduate school, kind of degree, institutional affiliation, position at the institution, "productivity level of another publication type", and "the mean number of authors per book") are examined. Main findings are as follows: (1) In books, groups who have a high level of productivity are researchers who; a) are in their sixties, b) garaduated from Tokyo University, c) hold a doctorate in literature, d) belong to national universities which hold the doctoral-course, e) are professors, f) have more than 10 articles and g) have a "mean number of authors per book" of 21. In articles, groups who have a high level of productivity are researchers who; a) are in forties, b) garaduated from Tokyo Univ. and universities which are famous for Japanese Literature, c) hold a doctorate in literature, d) belong to national universities which hold the doctoral course, e) are associate professors and f) have more than 6 books published. (2) As a result of the Quantification Theory I with these foctors, "mean number of authors per book" have the most influence on book productivity. But any factors do not have much influence on article productivity.