Stylometrics analyzes the style of texts based on some metric features. These methods have been mainly applied to modern Japanese texts, and shown its effectiveness especially for authorship attribution. However, when these methods are applied to classical literature texts, existence of variants for the same work causes problems because there are many variants for them, which rarely have an original text, and sometimes these variants are greatly different from the original one. This paper validates a method that represents a relationship between variants quantitatively, using edit distance or perplexity. Experiments on “Izumishikibu nikki”, which is one of the most popular diary works in the Heian period, shows that the proposed method has a better correspondence to the results shown in the previous bibliographical studies, compared to the conventional principal component analysis using multiple metric features. Furthermore, comparison with “Sarashina nikki”, which is another diary work in the Heian period, confirms that the difference between variants for the same work is much smaller than that between different works.

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I continue a study to elucidate the factors of “Inclusion of Loanwords into the Basic Words” in the newspaper texts written in the second half of the 20th century. KIM (2006a) showed clearly that “inclusion of many abstract loanwords into the basic words” occurred when the loanwords turned into synonymous superordinate of Japanese origin “Wago𔄢 and Chinese origin “Kango”, and gave lexical stylistics explanation that summarization of the newspaper texts in the second half of the 20th century needed many loanwords as superordinate words. In this paper, focusing on discourse-organizing function of superordinate, I found the fact that abstract noun loanwords were increasing the amount used to acquire and develop the discourse-organizing function (reiteration is core) by two forms (usage) of demonstrative phrase and noun (phrase) in apposition.
 The result confirms the validity of the prospect that discourse-organizing function relates to inclusion of abstract loanwords into the basic words.

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The present study maps the use of postpositional particles and auxiliary verbs to explore how these words can reflect writer's pathological mental state. Ten literary works written by Natsume Soseki(1867-1916), who is a foremost novelist in modern Japan and is known to suffer from recurrent mental symptoms by biographical and pathographical studies, were analyzed to extract linguistic information using a Japanese morphological analysis system (Chasen ). Data on the frequencies of the postpositional particles and auxiliary verbs were tested using hierarchical cluster analysis and principal component analysis. The results showed that the literary works were clustered roughly into three groups of his late thirties, early forties and late forties, which in accord with the course of the illness. Behaviormetric analysis of such function words can be a useful approach to the evaluation of writer's mental state.

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International Quantitative Linguistics Conference at Palacký University in Olomouc, Czech Republic International Quantitative Linguistics Conference 2014 (QUALICO 2014) was held at Palacký University in Olomouc, Czech Republic from May, 29th to June, 1st. The 20th anniversary of the International Quantitative Linguistics Association (IQLA) and the 20th anniversary of the Journal of Quantitative Linguistics (JQL) were celebrated. 65 talks and posters were accepted from 85 submitted abstracts, and there were ca. 60 participants coming from over 20 different countries. The sessions started with the opening lecture "Quantitative Linguistics: Some Characteristics" by Reinhard Köhler (Germany), followed by sessions on the Menzerath’s Law. There were four papers on Japanese quantitative linguistics by not only Japanese linguists but also Czech researchers. IQLA Council Business Meeting was also held and the new president was selected. The next conference will be scheduled in August 2016 at Trier University in Germany.

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