Results 41 to 50 of about 37,981 (219)

Proof of Conjectures on the Standard Deviation, Skewness and Kurtosis of the Shifted Gompertz Distribution

open access: yesRevstat Statistical Journal, 2021
Three conjectures on the standard deviation, skewness and kurtosis of the shifted Gompertz distribution, as the shape parameter increases to +∞, are proved. In this regard, the exponential integral function and polygamma functions are used in the proofs.
Fernando Jiménez Torres
doaj   +1 more source

Potek fermentacije škroba ob dodatku različnih vrst taninov

open access: yesActa Agriculturae Slovenica, 2007
Proučevali smo vpliv vrste in koncentracije različnih taninskih izvlečkov na kinetiko in vitro fermentacije škroba v vampnem soku. K škrobu smo dodali tri taninske izvlečke: kostanjev tanin (F75), kebračo tanin (QUE) in taninsko kislino (TAK) v različnih
Urška SIVKA, Andrej LAVRENČIČ
doaj   +1 more source

The estimation of genetic parameters for growth curve traits in Raeini Cashmere goat described by Gompertz model [PDF]

open access: yes, 2018
The objectives of this study were to describe growth curve of Raeini Cashmere goat applying the Gompertz growth model and genetic evaluation of growth curve-related traits including model parameters of A, B and K, inflection age (IA) and inflection ...
Ghiasi, Heydar   +2 more
core   +1 more source

Scaling Function, Universality and Analytical Solutions of Generalized One-Species Population Dynamics Models

open access: yes, 2010
We consider several one-species population dynamics model with finite and infinite carrying capacity, time dependent growth and effort rates and solve them analytically.
Cabella, Brenno Caetano Trocca   +2 more
core   +1 more source

Parameter identification for gompertz and logistic dynamic equations.

open access: yesPLoS ONE, 2020
In this paper, we generalize and compare Gompertz and Logistic dynamic equations in order to describe the growth patterns of bacteria and tumor. First of all, we introduce two types of Gompertz equations, where the first type 4-paramater and 3-parameter ...
Elvan Akın   +3 more
doaj   +1 more source

Powers of the Stochastic Gompertz and Lognormal Diffusion Processes, Statistical Inference and Simulation

open access: yesMathematics, 2020
In this paper, we study a new family of Gompertz processes, defined by the power of the homogeneous Gompertz diffusion process, which we term the powers of the stochastic Gompertz diffusion process.
Eva María Ramos-Ábalos   +2 more
doaj   +1 more source

The model muddle: in search of tumour growth laws

open access: yes, 2013
In this article we shall trace the historical development of tumour growth laws, which in a quantitative fashion describe the increase in tumour mass/volume over time. These models are usually formulated in terms of differential equations that relate the
Gerlee, P.
core   +1 more source

Determinants of the population growth of the West Nile virus mosquito vector Culex pipiens in a repeatedly affected area in Italy [PDF]

open access: yes, 2014
Background The recent spread of West Nile Virus in temperate countries has raised concern. Predicting the likelihood of transmission is crucial to ascertain the threat to Public and Veterinary Health.
Bonfanti, L.   +5 more
core   +1 more source

Another analytic view about quantifying social forces

open access: yes, 2012
Montroll had considered a Verhulst evolution approach for introducing a notion he called "social force", to describe a jump in some economic output when a new technology or product outcompetes a previous one.
Debouxhtay P.   +6 more
core   +1 more source

The inverted Gompertz-Fréchet distribution with applications

open access: yesScientific African, 2023
The probability distribution is an important aspect of probability theory because of its vast relevance in almost all human disciplines. Its applicability in finance, medicine, agriculture, actuarial science, demography, and econometrics, to mention but ...
Eno E.E. Akarawak   +5 more
doaj   +1 more source

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