نتایج جستجو برای: logistic growth model

تعداد نتایج: 2883107  

Journal: :Poultry science 2006
S N Nahashon S E Aggrey N A Adefope A Amenyenu

This study was conducted to describe the growth pattern of the French guinea fowl, a meat-type variety. Using BW data from hatch to 9 wk, 2 nonlinear mathematical functions (Gompertz and logistic) were used to estimate growth patterns of the French guinea fowl. The French guinea fowl did not exhibit sexual dimorphism for growth characteristics. From the Gompertz model, the asymptotic BW, growth...

Journal: :Mathematical biosciences 2002
A Tsoularis J Wallace

A variety of growth curves have been developed to model both unpredated, intraspecific population dynamics and more general biological growth. Most predictive models are shown to be based on variations of the classical Verhulst logistic growth equation. We review and compare several such models and analyse properties of interest for these. We also identify and detail several associated limitati...

Journal: :journal of agricultural science and technology 0
k. zarafshani agricultural extension and education, agricultural and natural resource faculty, razi university, kermanshah, islamic republic of iran. sh. ghasemi agricultural extension and education, agricultural and natural resource faculty, razi university, kermanshah, islamic republic of iran. e. houshyar department of biosystems and engineering, jahrom university, jahrom, p. o. box: 74135-111, islamic republic of iran. r. ghanbai department of rural development, college of agriculture, lorestan university, lorestan, islamic republic of iran. s. van passel centre for environmental sciences, hasselt university, belgium. hasselt university, belgium. h. azadi centre for environmental sciences, hasselt university, belgium.

canola production is an important alternative for agricultural policy-makers in iran to reduce dependency on the imported vegetable oils. nevertheless, the canola planted area is only increasing at a slow pace, indicating a low willingness-to-accept of farmers. the general aim of this study was to determine the factors influencing the canola adoption in the kermanshah province in western iran. ...

Journal: :Computers & Mathematics with Applications 1986

2006
Bo Hu Jun Shao Mari Palta BO HU JUN SHAO MARI PALTA

Logistic regression with binary and multinomial outcomes is commonly used, and researchers have long searched for an interpretable measure of the strength of a particular logistic model. This article describes the large sample properties of some pseudo-R statistics for assessing the predictive strength of the logistic regression model. We present theoretical results regarding the convergence an...

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