62总体回归函数(PRF) Table 6-1 Weekly lotto expenditure in relation to weekly personal disposable income. Figure at next ppt) Personal Disposable Weekly Expenditure on Lotto($) Customer150175200225250275300325350375 875 35 4042434546 23456789 31 3630053208 34 33 33272829 3 31 2627 582 202226 27 33 30 182023 2526 2830 21 13 18 25 31 33 19 Mean20.9022.10244026.1027.302920303031.9033.03360 6-96-9 6.2 总体回归函数(PRF) Table 6-1 Weekly lotto expenditure in relation to weekly personal disposable income. (Figure at next ppt)