dataset = WheatYield begin description Data are from Bean, JASA, 1930, p. 428. Each case gives observations on the yield of wheat in an eastern state. Response = wheat yield , in bushles per acre Predictors Rainfall in inches during February, March and April Average Temperature in degrees in March and April, Number of days in which snow cover exceeds 1 inch. end description begin variables Col 0 = Rainfall Col 1 = SnowDays Col 2 = Temp Col 3 = Yield end variables begin data ( 7 33 47 16.8 3.5 10 55 14 4.8 30 49 16.5 6.4 18 47.5 19.3 8.5 20 45.5 15.5 1.4 33 50 20.8 3 24 44 22.6 5.3 8 47.7 17.5 6.6 13 45.9 16.5 9 8 54 7 8 24 50 14 8 16 52 12 )