In this study, new unit quantile regression model, called the Unit Gamma/ Gompertz for bounded responses is developed by re-parameterizing Gamma/Gompertz distribution. To estimate parameters of maximum likelihood approach used to develop estimators parameters. Monte Carlo simulations are test consistency model. The application model illustrated using three real life datasets and results reveale...

Many successful technology forecasting models have been developed but little research has explored the relationship between sample set size and forecast prediction accuracy. This research studies the forecast accuracy of large and small data sets using the simple logisticl, Gompertz, and the extended logistic models. The performance of the models were evaluated using the mean absolute deviation...

An experiment was conducted to study energy retained (TER) as fat (TERF) and protein (TERP) in 3 strains of birds with different growth rate; commercial broilers, Barred Plymouth Rock, and Leghorns. Birds were fed ad libitum a diet providing 3,100 kcal of AMEn/kg and 20% CP from 0 to 42 d. Body composition, TER, TERF, and TERP were determined at 0, 7, 10, 15, 19, 23, 28, 33, 37, and 42 d of age...

Taylor's law (TL) asserts that the variance in a species' population density is a power-law function of its mean population density: log(variance) = a + b × log(mean). TL is widely verified. We show here that empirical time series of density of the Hokkaido gray-sided vole, Myodes rufocanus, sampled 1962-1992 at 85 locations, satisfied temporal and spatial forms of TL. The slopes (b ± standard ...

_______________________________________________________________________________________ Abstract The objective of this work was to estimate and compare the growth curve parameters for live weight of indigenous Venda and Naked Neck chickens and carry out some analyses to test the existence of differences in the growth pattern between these breeds. The data were collected from the two breeds of c...

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.

It is often necessary in applied statistical research to perform direct numerical optimization because the problem can not be transformed to be solved by standard procedures implemented in the statistical packages. One example of such a problem comes from the field of growth modeling: The Polynomial Gompertz model is known to provide a good fit to individual growth curves and growth percentiles...

This study compared the use of five different models to describe the growth from birth to 20 weeks of age of kids from both genders of nondescript goats. Fifty nine (59) nondescript kids were weighed weekly at the university of Maiduguri livestock teaching and research farm, Nigeria and the live weights were modeled. Biologically relevant variables were estimated for each kid from the Logistic,...

It is shown that if the computer model of biological ageing proposed by Stauffer is modified such that the late reproduction is privileged then the Gompertz law of exponential increase of mortality can be retrieved.