人们以前常常采用古典线性回归模型对住院费用进行分析，但是古典线性回归模型是建立在一些假设之上的。
People used to analyze hospitalization expense with general linear models, but general linear model is built on some hypothesis.
人们以前常常采用古典线性回归模型对住院费用进行分析，但是古典线性回归模型是建立在一些假设之上的。
People used to analyze hospitalization expense with general linear models, but general linear model is built on some hypothesis.
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