In this study, a modeling study was carried out on the weekly average values of henna partridge egg production. For purpose, yields 148 days from herd consisting 320 breeders were taken and cubic spline, Gompertz, Logistic, Richard, Schunute, Quadratic Spline, McNally Gamma equations used in modeling. comparison goodness fit equations, Determination Coefficient〖(R〗^2), Mean Square Error (MSE), ...

In this paper, we introduce a new four-parameter generalized version of the Gompertz model which is called Beta-Gompertz (BG) distribution. It includes some well-known lifetime distributions such as beta-exponential and generalized Gompertz distributions as special sub-models. This new distribution is quite flexible and can be used effectively in modeling survival data and reliability problems....

The Gompertz model is well known and widely used in many aspects of biology. It has been frequently used to describe the growth of animals and plants, as well as the number or volume of bacteria and cancer cells. Numerous parametrisations and re-parametrisations of varying usefulness are found in the literature, whereof the Gompertz-Laird is one of the more commonly used. Here, we review, prese...

Purpose: To analyze the capabilities of different classical mathematical models to describe growth multicellular spheroids simulated with an on-lattice agent-based Monte Carlo model that has already been validated. Methods: The exponential, Gompertz, logistic, potential, and Bertalanffy have fitted in situations volume data generated a simulates spheroid growth. Two samples pseudo-data, obtaine...

Maximum lifespan has been one of the most common aging measures in comparative studies, while the Gompertz model has recently attracted both proponents and critics of its capacity to adequately describe the acceleration of mortality in the oldest age classes. The Gompertz demographic model describes age-dependent mortality rate acceleration and age-independent mortality using the parameters alp...

We develop a new generalized family of the Gompertz-G distribution, namely, Marshall-Olkin-Gompertz-G distribution. Statistical properties proposed model are presented. Some special cases distributions Maximum likelihood estimates parameters also determined. A simulation study was conducted to assess performance maximum estimates. Applications demonstrate usefulness Marshall-Olkin-Gompertz-Weib...

The thermal time, expressed in accumulated growing degree-days (AGDD), was used as a predictor to describe and simulate the independent growth of two pasture crops, Lolium perenne L. Bromus valdivianus Phil. Two sinusoidal models (four-parameter Logistic Gompertz) were applied variables (total leaf blade length per tiller—LBL, herbage mass—AHM). nutritive value pastures predicted modeled using ...

In this paper we provide an interval of existence of critical mortality rate parameters A and α and its asymptotic expressions in Gompertz survival model, in the absence of age specific mortality data. c © 2007 Elsevier Ltd. All rights reserved.

Factors determining the diffusion of digital mobile telephony across 200 developed and developing countries in the 1990s are studied with the aid of a Gompertz model. The market size and network effects are found to play more important roles in the developing countries; there is also more need for complementing innovations in, for example, financial and payment systems. Even though the developi...