I estimate the relationship between combinations of multiple services for formal at-home elder care and health status. As a reasonable substitute for expensive institutional care, at-home formal elderly care is gaining popularity in developed countries. Because at-home care is composed of many small and complementary services, the relationship between multiple service combinations and health status requires analysis. However, the high dimensionality of these combinations makes estimation difficult. This study employs a regression analysis using care service combinations as cross-dummy explanatory variables. To reduce the combination dimensions, I select the combinations that are purchased jointly by a sufficient number of the elderly using basket analysis. I apply this method to claims data for Japanese long-term care, for which the social insurance program has resulted in the emergence of a market that offers many care services for the elderly. The empirical results show that only 200 combinations of 14 at-home care services are used by more than 0.03% of the insured in Japan. Of these combinations, rehabilitation services have a considerable positive correlation with the health status of the elderly. However, their use is limited owing to regional disparities in the location of such services.

我估计用于正式在家中老年人护理的多种服务的组合与健康状况之间的关系。作为昂贵的机构护理的合理替代，在家中正式的老年护理在发达国家变得越来越受欢迎。由于家庭护理由许多小的补充服务组成，因此需要分析多种服务组合与健康状况之间的关系。然而，这些组合的高维数使得估计困难。本研究采用回归分析，将护理服务组合用作交叉虚拟的解释变量。为了减少组合的尺寸，我使用购物篮分析选择了足够数量的老年人共同购买的组合。我将此方法应用于日本长期护理的理赔数据，为此，社会保险计划催生了一个为老年人提供许多护理服务的市场。实证结果表明，在日本，超过0.03％的被保险人使用了200种组合的14种家庭护理服务。在这些组合中，康复服务与老年人的健康状况有相当大的正相关关系。但是，由于此类服务地点的地区差异，它们的使用受到限制。