Resistant cross- age smoothing of age-specific percentiles for growth reference data

American Journal of Human Biology : the Official Journal of the Human Biology Council
John H Himes, David C Hoaglin

Abstract

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. Row percentiles were transformed to logarithms to promote symmetry and to render variability more nearly homogeneous across ages. The delineation involved smoothing resistantly the sequences of age-specific log medians and the sequence of age-specific positive differences between the "4253H, twice" (Velleman, J. Am. Statist. Assoc., 75:609-615, 1980). The delineation concluded by recombining these smoothed sequences to obtain smoothed percentiles in the log scale. Finally, the logarithmic transformation was reversed, yielding the smoothed age-specific percentiles. Comparisons of smoothed results from resistant, delineation with the original data indicated a satisfactory fit. Comparisons with published smoothed percentiles, obtained from the same data by a cubic-spline procedure, showed that the resistant delineation captured the structure of the raw data better than the cubic-spline procedure. The resistant delineation procedure makes few assumptions of the underlying data, it ensures a proper order relati...Continue Reading

References

Feb 1, 1975·Archives of Disease in Childhood·J M Tanner, R H Whitehouse
Sep 1, 1985·The Journal of Pediatrics·J M Tanner, P S Davies
Nov 1, 1981·The American Journal of Clinical Nutrition·A R Frisancho
Feb 1, 1982·The American Journal of Clinical Nutrition·C E Cronk, A F Roche
Sep 1, 1980·The American Journal of Clinical Nutrition·A F Roche, J H Himes

❮ Previous
Next ❯

Citations

Sep 5, 2001·American Journal of Human Biology : the Official Journal of the Human Biology Council·John H. Himes
Jan 26, 2011·Statistics in Medicine·Z ZhangG M Buck Louis
Apr 24, 1999·Paediatric and Perinatal Epidemiology·G R AlexanderR Goldenberg
Dec 8, 2006·Journal de gynécologie, obstétrique et biologie de la reproduction·A EgoJ Zeitlin

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.

Related Papers

Pediatrics
P R SwyerB Reichman
The American Journal of Clinical Nutrition
S B Merrow
Anadolu Kardiyoloji Dergisi : AKD = the Anatolian Journal of Cardiology
Bahri Akdeniz
© 2022 Meta ULC. All rights reserved