※ 引述《Xrrr (rrrr)》之铭言： : Suppose you are assigned a task to study the Spontaneous Consumption : (SC) and Marginal Propensity to Consume (MPC) based on aggregate : annual consumption and disposable income data of a country from 1980 : to 2006. Describe the procedures to test whether the SC and MPC : before 1996 are different those after 1996: : (a) Describe the regression model you will use and define all variables : including dummy variables if any. : (b) Describe the condition for statistics under which the Spontaneous : Consumptions (SC) before 1996 is larger than that after 1996. : (c) Describe the condition for statistics under which the Marginal : Propensity to Consume (MPC) before 1996 is larger than that after 1996. : 谢谢你 (a) 自变数 let D= 1 ,before 1996 0 ,after 1996 I为所得 应变数 为消费支出 model C=Bo+B1*I+B2*D+B3*I*D+u (b) 1996年以前平均消费:E(C|D=1)=(Bo+B2)+(B1+B3)*I 1996年以後平均消费:E(C|D=0)=B0+B1*I Ho:B2<0 (SC before 1996 is smaller than that after 1996) Ha:B2>0 (SC before 1996 is larger than that after 1996) (c) Ho:B3<0 (MPC before 1996 is smaller than that after 1996) Ha:B3>0 (MPC before 1996 is larger than that after 1996) --

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