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...

An ice-free Arctic summer would have pronounced impacts on global climate, coastal habitats, national security, and the shipping industry. Rapid and accelerated Arctic sea ice loss has placed the reality of an ice-free Arctic summer even closer to the present day. Accurate projection of the first Arctic ice-free summer year is extremely important for business planning and climate change mitigat...

the application time of weed control methods due to population dynamics of this species is one of the most important aspects of weed management. in this study tried to use four sigmoidal functions (logistic, gompertz, richards and weibull) and to select the best fit by using r2adj , rmse and aicc. our results showed that the seedling models of every weed are different from one another and the m...

The anaerobic degradation of gelatin results in a two-phase cumulative biogas production curve, i.e., diauxie behaviour. modified Gompertz model is normally used to fit these curves but due the it would result less accurate representation. Furthermore, this inhibition slows down batch reactors. This study adapted with behaviour and investigate that leads diauxie. Results show can high accuracy ...

Classical growth functions used in animals are nonlinear form. Various numerical methods have been developed to estimate parameters functions. In this paper, the discrete-time stochastic Gompertz model for Adana pigeons is considered. It assumed that parameter time-varying. The time-varying estimation of was made using adaptive Kalman filter (AKF). aim study investigate whether and method handl...

In this communication, based upon the deterministic Gompertz growth law, a stochastic nonlinear model of tumour growth is proposed to model the conventional size-dependent therapy strategy of tumours. The probability density function of the size of the tumour obeys a nonlinear Fokker-Planck equation which can be solved analytically. It is found that during the cancer treatments the dose intensi...