R 是由于组间交迭引起的残差,仅当组与组之间没有交迭时R 才会为0.我们将分两步进行分组分解。首先,将全国分为城市和农村进行分解,因为我们认为这是最重要的差别。其次,对城市和农村分别按照东部、中部和西部进行分组。(注:在研究过程中,我们依中国传统的定义方式,把所有的样本分为三个部分;东部地区包括北京,辽宁,江苏,浙江,山东和广东中部地区包括吉林,河北,山西,江西,安徽,河南,湖北,湖南;西部地区包括广西,四川,重庆,云南,贵州,陕西,甘肃和新疆(斜体字表示它们也包含在城市调研之中)。)本文将分别给出以上各种分组的均值和医疗支出集中指数。(注:当构思分析的过程时,我们曾经考虑另外一种方法,即把家庭医疗支出按年龄、性别分组,使其更加标准化,但后来我们决定不这样做。因为在我们的分析中,对于不同的空间部分,分析主体在这方面的差异并不是很大。)
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