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Data Sets: Birthweight Data BIRTHWEIGHT DATA: The file home/heckman/public_html/data/birthweights/data.txt contains 362 lines. column 1 = proportion of male infants that survived to 28 days column 2 = standardized gestation time (days) column 3 = standardized infant birthweight (pounds) column 4 = the number of infants falling in the particular weight/gestation category To read into Splus: temp <- matrix(scan("/home/heckman/public_html/data/birthweights.data.txt"),362,4,byrow=T) Birthweights were rounded off to nearest half-pound in original paper. One outlier (13 lbs) was deleted from this data set. This file represents 7036 individuals. Data are from Karn and Penrose (1951), "Birth weight and gestation time in relation to maternal age, parity and infant survival", Annals of Eugenics, 16, 147-164.