Berkeley Guidance Study (Data file: BGSgirls) The Berkeley Guidance Study enrolled children born in Berkeley, California, between January 1928 and June 1929, and then measured them periodically until age 18 (Tuddenham and Snyder, 1954). The data we use include heights in centimeters at ages 2, 9, and 18, (HT2, HT9, and HT18), weights in kilogram (WT2, WT9, and WT18), leg circumference in centimeters (LG2, LG9, and LG18), and strength in kilogram (ST2, ST9, and ST18). Two additional measures of body type are also given, soma, somatotype, a scale from 1, very thin, to 7, obese, and body mass index, computed as BMI18 = WT18/ (HT18/100)2 , weight in kilogram divided by the square of mass in meters, a standard measure of obesity. The data are in the files BGSgirls for girls only, BGSboys for boys only, and BGSall for boys and girls combined (in this last file an additional variable Sex has value 0 for boys and 1 for girls). For this problem use only the data on the girls.5