This paper develops a consumption and portfolio-choice model of a retiree who allocates wealth among four assets: a riskless bond, a risky asset, a real annuity, and housing. Unlike previous studies that treat health expenditures as exogenous negative income shocks, this paper builds on the Grossman model to endogenize health expenditures as investments in health. I calibrate the model to expla...

The paper describes a comparative study of existing and novel text preprocessing and classification techniques for domain detection of user utterances. Two corpora are considered. The first one contains customer calls to a call centre for further call routing; the second one contains answers of call centre employees with different kinds of customer orientation behaviour. Seven different unsuper...

This paper describes Classification Subtask at NTCIR-5 Patent Retrieval Task. We perform two subtasks for patent classification using a multi-dimensional classification structure called “F-term (File Forming Term) classification system”. The first one is Theme Categorization Subtask, where each participant classifies a patent into technological fields called themes. The second one is F-term Cat...

This paper is a short empirical study of the performance of centrality and classification based iterative term set expansion methods for distributional semantic models. Iterative term set expansion is an interactive process using distributional semantics models where a user labels terms as belonging to some sought after term set, and a system uses this labeling to supply the user with new, cand...

In the present paper, a term weighting classification method using the chi-square statistic is proposed and evaluated in the classification subtask at NTCIR-6 patent retrieval task. In this task, large numbers of patent applications are classified into Fterm categories. Therefore, a patent classification system requires high classification speed, as well as high classification accuracy. The chi...

OBJECTIVE To examine the relationship between physical frailty and risk of disability, and to identify the component(s) of frailty with the most impact on disability in community-dwelling older adults. DESIGN Prospective cohort study. SETTING A Japanese community. PARTICIPANTS 4341 older adults aged ≥65 living in the community participated in a baseline assessment from 2011 to 2012 and we...