Best fitting tumor growth models of the von Bertalanffy-PütterType
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Fitting the von Bertalanffy growth equation to polar bear age–weight data
KINGSLEY, M. C. S. 1979. Fitting the von Bertalanffy growth equation to polar bear age-weight data. Can. J. Zool. 57: 1020-1025. Heavy sea ice in the Canadian Arctic in the winter of 19731974 reduced seal populations; polar bears, preying principally on seals, consequently lost weight. The nature and degree of this weight loss was investigated by examining the parameters of von Bertalanffy grow...
متن کاملOn the exponent in the Von Bertalanffy growth model
Von Bertalanffy proposed the differential equation m'(t) = p × m(t) a - q × m(t) for the description of the mass growth of animals as a function m(t) of time t. He suggested that the solution using the metabolic scaling exponent a = 2/3 (Von Bertalanffy growth function VBGF) would be universal for vertebrates. Several authors questioned universality, as for certain species other models would p...
متن کاملStochastic Age-frequency Estimation Using the Von Bertalanffy Growth Equation
The method of estimating age frequency from length frequency via the von Bertalanffy growth equation is deterministic and yields biased results. Most of the biascan be removed by incorporating a stochastic element in the von Bertalanffy relationship. The stochastic element is based on estimated probabilities of lengths by intervals at age. the probabilities being estimated from variances in len...
متن کاملLikelihood Methods for the Von Bertalanffy Growth Curve
Likelihood methods for the von Bertalanffy growth curve are examined under the assumption of independent, normally distributed errors. The following are examined: determining the best method of estimation, relationships between methods of estimation, failure of assumptions, constructing confidence regions, and applying likelihood ratio tests. An eXanlple is presented illustrating many of the me...
متن کاملGrowth rate fitting using the von Bertalanffy model: analysis of natural populations of Drepanotrema spp. snails (Gastropoda: Planorbidae).
The genus Drepanotrema includes six species in Argentina. The life cycle in natural systems of Drepanotrema depressissimum, and D. lucidum has been little studied, except for some casual observations. The aim of this study is to analyze main population trends (age structures, recruitment periods, life span and curves of individual growth) in Paiva pond, Argentina. We explored growth model fitti...
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ژورنال
عنوان ژورنال: BMC Cancer
سال: 2019
ISSN: 1471-2407
DOI: 10.1186/s12885-019-5911-y