Several sigmoidal functions (logistic, Gompertz, Richards, Schnute, and Stannard) were compared to describe a bacterial growth curve. They were compared statistically by using the model of Schnute, which is a comprehensive model, encompassing all other models. The t test and the F test were used. With the t test, confidence intervals for parameters can be calculated and can be used to distingui...

The Gompertz function was formulated to represent an actuarial curve, yet it often fits growth of organisms, organs and tumors. Despite numerous attempts, no consensus has been forged about the biological foundation of the broad applicability of the model. Here we revisit the Gompertzian notion of the "power to grow" and equate it with growth fraction. Aside from conferring biological interpret...

In this paper a new four-parameter lifetime distribution named “the Exponentiated gompertz-poisson (E-GP) distribution” has been suggested that it has a decreasing, increasing, bathtub-shaped and inverse bathtub-shape for modeling lifetime data. The Exponentiated gompertz-poisson has applications in economics, actuarial modelling,reliability modeling, lifetime and queuing problems and biologica...

The modified sigmoidal bacteria growth functions (the Gompertz, logistic, and Richards) were used to evaluate the methane production process kinetics of agricultural wastes. mesophilic anaerobic co-digestion experiments conducted with various wastes as feedstocks, including cow manure, corn straw, grape leaves, vines, wine residue, strawberry tomato leaves. results showed that manure other incr...

Aim (i) To assess the dependence between form of decrease in biological similarity with distance (distance-decay) and species range size (ii) to introduce use a sigmoidal model, Gompertz function, as flexible alternative able fit distance-decay models under wide variety sizes. Location Applicable worldwide. Methods We computed curves from simulated communities how sizes shape functional pattern...

This paper presents an extension of the generalized extreme value (GEV) distribution, based on T-X family distributions: Gompertz-generated distributions that make existing distribution more flexible called Gompertz-general (Go-GEV) distribution. Some properties proposed are introduced, and a new is applied to actual data, namely rainfall in Lopburi Province, by comparing model with traditional...