著者

山本 信一 井上 麻央

出版者

生活経済学会

雑誌

生活経済学研究 (ISSN:13417347)

巻号頁・発行日

vol.41, pp.55-64, 2015

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Much research has analyzed the relationship between class size and scholastic aptitude. Specifically, studies have focused on whether or not reducing class size contributes to improving children's scholastic aptitude. Not all research shows such an impact, with some studies showing no positive effect. These inconsistent results suggest that other factors besides class size have a major influence on scholastic aptitude. This paper not only focuses on class size but also examines the multicollinearity of select factors considered economically relevant. Data on the percentage of correct answers (by third grade public middle school students, from 2007 to 2010) by prefecture obtained from the National Survey of Scholastic Aptitude and Learning Environment were used as the dependent variable. Results of all panel data models used in the paper showed that students in smaller classes tended to answer a higher percentage of answers correctly as compared to their counterparts in larger classes. Moreover, the results clearly suggested that this effect was more pronounced for applied basic knowledge skills in mathematics. The coefficient for the household learning rate used as an explanatory variable was found to be negative, indicating that prefectures with lower levels of scholastic aptitude among public middle schools tend to have more education-oriented households that invest in education outside of school.

著者

山本 信一 井上 麻央 米山 高生

出版者

生活経済学会

雑誌

生活経済学研究 (ISSN:13417347)

巻号頁・発行日

vol.45, pp.53-64, 2017 (Released:2017-09-30)

参考文献数

6

被引用文献数

5

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The aging population has resulted in the percentage of GDP allocated to healthcare costs reaching about 10%, and further increases are expected. To manage this issue, the Ministry of Health, Labor, and Welfare is attempting to improve the population's lifestyle and to moderate healthcare cost increases by conducting medical checkups and providing health guidance for lifestyle improvements. The study data comprise medical prescriptions and medical examinations of 24,725 people who have developed diabetes and 13,453 people who have developed high blood pressure (data from the Japan Medical Data Center). Based on a multiple regression analysis, we compare people with good lifestyle habits and people with bad lifestyle habits to examine how the increases in their healthcare costs changed as a result of their diagnoses. For people who developed diabetes, those who properly controlled their BMI and LDL cholesterol levels, refrained from smoking and drinking, and exercised regularly (i.e., practiced good lifestyle habits) were able to maintain satisfactory medical examination results (diabetes). Based on these results, we prove statistically that the increase in healthcare costs is less for people who keep good lifestyle habits, even if they develop diabetes. Similarly, people who developed high blood pressure and practiced good lifestyle habits were able to maintain satisfactory medical examination results (high blood pressure). Again, the increase in the healthcare costs for this group was less, even if they developed high blood pressure, although, in this case, exercising regularly was not a relevant factor.

著者

山本 信一

出版者

日本保険学会

雑誌

保険学雑誌 (ISSN:03872939)

巻号頁・発行日

vol.2007, no.597, pp.597_103-597_118, 2007-06-30 (Released:2011-09-28)

参考文献数

9

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日本は,少子高齢化が続く過程で,東京一極集中を強化しつつあり,地震・核テロ・鳥インフルエンザ等のリスクは,RMS社の調査等によれば,予想外に高まっているように思われる。日本の生保業界においては,核テロ等の可能性を考えた場合,昼間にビル単位でどれだけの付保がされているかを試算しておく必要もあろう。東京都の昼間人口調査(2000年)では,皇居も含めた千代田区の昼間人口密度は7万3千人/km2となっており,皇居を除いた人口密度は一層高く,丸の内再開発で,極度の集中化が一層進みつつある。これへの対応策としては,(1) ビル単位で,再保険への出再を検討する。(2) 約款の保険金支払免責条項に,テロ・地震を戦争その他の変乱と同様に,保険金削減の対象である旨,明記する。などが考えられるが,それ以外も含めた集積リスクの検討が必要であろう。

著者

山本 信一

出版者

Japanese Society for Tropical Agriculture

雑誌

熱帯農業 (ISSN:00215260)

巻号頁・発行日

vol.8, no.4, pp.193-201, 1965

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筆者は, 1962年7月から1カ年, 単身軽装備で西アフリカのナイジェリア連邦東部州にあつて, 同国の稲作を指導した.その結果, 土壌改良と用水管理が最も重要であるとし, 上記英文の稲作改善勧告書を作成提出した。