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资料来自1985年中国青少年体质及健康研究。首先计算儿童青少年各年龄时身高、体重和胸围测量值占成人测量值的百分比(称为成熟度),然后将成熟度作Logit变换,并用三次曲线方程拟合。最后应用优选法计
Data from 1985 China Youth Physical Fitness and Health Study. First calculate the height, weight, and bust measurements of children and adolescents as a percentage of adult measures (called maturity) at each age, then logit the maturity and fit it with a cubic curve equation. Finally, the application of optimal method