Velocity and acceleration of height growth using kernel estimation.
paper
Cited
Public
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- Authors
- Gasser, T; Köhler, W; Müller, H G; Kneip, A; Largo, R; Molinari, L; Prader, A
- Year
- 1984
- Journal
- Annals of human biology
- PMID
- 6486712
- DOI
- 10.1080/03014468400007311
A method is introduced for estimating acceleration, velocity and distance of longitudinal growth curves and it is illustrated by analysing human height growth. This approach, called kernel estimation, belongs to the class of smoothing methods and does not assume an a priori fixed functional model, and not even that one and the same model is applicable for all children. The examples presented show that acceleration curves might allow a better quantification of the mid-growth spurt (MS) and a more differentiated analysis of the pubertal spurt (PS). Accelerations are prone to follow random variations present in the data, and parameters defined in terms of acceleration are, therefore, validated by a comparison with parameters defined in terms of velocity. Our non-parametric-curve-fitting approach is also compared with parametric fitting via a model suggested by Preece and Baines (1978).
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