[Quantitative and qualitative aspects of the representation of aging curves for the histological composition of the human submandibular gland by empirical regression].
A discussion of the possibilities is given of parametric and of nonparametric description of measured aging processes. As examples serve the counted volume portions of different histological structures in the human submandibular gland. As best suited approach the nonparametric evaluation of data by empirical regression is recommended. It is studied which qualitative changes are shown by the empirical regression curves if the sample size will be modified. For this the original sample size of 42 measured values is reduced in 2 steps to 35 and 29 values by removing at random firstly 7 and secondly additional 6 values. The tendencies in the aging courses represented by empirical regression curves will hardly altered by these reductions whereas a nonrandom elimination of outstanding points yields to marked changes in the calculated empirical regression curves. The influence of different local sample variances and densities of the measured points on the shape of the aging curves is stressed.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D008875:Middle Aged; D009092:Mucous Membrane / Q000033:anatomy & histology / Q000502:physiology; D012044:Regression Analysis; D013363:Submandibular Gland / Q000033:anatomy & histology / Q000502:physiology*
Quantitative und qualitative Aspekte der Darstellung von Alternskurven der Gewebszusammensetzung der menschlichen Unterkieferdrüse durch Empirische Regression.