(*
DATA9-1: Data for the demand for ice cream
    Source: Hildreth-Lu paper, Table D16, page 73
    Four week periods from March 18, 1951 to July 11, 1953
    demand = per capita consumption of ice cream in pints
             (Range 0.256 - 0.548)
    income = weekly family income in dollars (Range 76 - 96)
    price  = price of ice cream in dollars per pint (Range 0.26 - 0.292)
    temp   = mean temperature in Fahrenheit (Range 24 - 72)
*)
demand income price temp ;
1 1 30
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