✦ LIBER ✦
Resistant cross- age smoothing of age-specific percentiles for growth reference data
✍ Scribed by John H. Himes; David C. Hoaglin
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 754 KB
- Volume
- 1
- Category
- Article
- ISSN
- 1042-0533
No coin nor oath required. For personal study only.
✦ Synopsis
Resistant delineation, a technique adapted from exploratory data analysis (Tukey, Exploratory Data Analysis, 1977), was applied to smooth age-specific percentiles for triceps skinfold thickness across ages from 1 to 20 years. Raw percentiles were transformed to logarithms to promote symmetry and to render variability more nearly homogeneous across ages. The delineation involved smoothing resistantly the sequence of age-specific log medians and the sequences of age-specific positive differences between the logarithms of successive percentiles using a compound nonlinear smoother, ~