例10-2虚拟变量的回归模型,计算结果见p214 Table 10-2 Food expenditure in relation to after-tax income and sex Observation Food expenditure After-tax income Sex 1983000 11557.00 1.000000 12345678 2987000 29387.00 1.000000 2993000 3146300 1.000000 3156000 2955400 1.000000 2706.000 2513700 1.000000 2217000 1495200 1.000000 2230000 11589.00 0000000 3757.000 3332800 0000000 3821000 3615100 0.000000 10 3291000 3544800 0000000 3429000 3298800 0.000000 12 2533000 2043700 0.000000 Notes: Food expenditure= Expenditure on food in dollars After-tax income After-tax income in dollars Sex= 1 if female, o if male 10-6 Source: Extracted from Table 10-110-6 例 10-2虚拟变量的回归模型，计算结果见p214 Table 10-2 Food expenditure in relation to after-tax income and sex