例10-1虚拟变量的回归模型 Table 10-1 Food expenditure in relation to after-tax income, sex, and age Food expenditure After-tax income, Food expenditure, After-tax income female($ female(S) male(S) male($) <25 1983 11557 2230 11589 25-34 2987 29387 3757 33328 2993 31463 3821 36151 45-54 3156 29554 3291 35448 55-64 2706 25137 3429 32988 65> 2217 14952 2533 20437 Note: The food expenditure and after-tax income data are averages based on the actual number of people in various age groups. The actual numbers run into the thousands SourceConsumerExpenditureSurveyBureauofLaborStatisticshttp://sTats.blsgow/cex/cSxcross.htm 10-510-5 例 10-1虚拟变量的回归模型 Table 10-1 Food expenditure in relation to after-tax income, sex, and age