| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
The patterns of occurrence of key words related to the main theme of documents were analyzed as binary time series data using the method of time series analysis. The study has shown that the stochastic processes governing the patterns of occurrence of important words in documents were stochastic processes which are very different from a simple Poisson process. The autocorrelation functions of these words were found to be of extended exponential type, and their waiting time distributions have fractal structures. Furthermore, it was found that the Hawkes process can be used as a promising model to describe these stochastic processes.
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