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Showing 1 to 8 of 8 for “"Gompertz Model"”.
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Defining a sub-Saharan fertility pattern and a standard for use with the relational Gompertz model
The relational Gompertz model is often used to obtain fertility estimates for sub-Saharan Africa populations. This indirect estimation technique is dependent on a fertility standard - the Booth standard. This standard was developed in 1979 using a selection of 33 Coale-Trussell schedules congruent …
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Assessment of subnational level birth registration data in South Africa
… and TFR. The Indirect method of relational Gompertz model is used to calculate robust estimates of actual births that occurred in the twelve-month period before 2011 Census and 2016 Community Survey, respectively. Then, the Hauer and Schmertmann (2020) method of determining fertility was …
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DESIGNS FOR TESTING LACK OF FIT FOR A CLASS OF SIGMOID CURVE MODELS
… to accurately estimate the parameters of the model. In contrast to a large literature and extensive results on optimal designs for linear models, research on the design for nonlinear, including sigmoid curve, models has not kept pace. Furthermore, most of the work in the optimal design …
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Assessment of Age, Diet, and Growth of Yellow Perch ( Perca flavescens) in Cheat Lake, West Virginia
… to evaluate the applicability of various growth models. Four candidate models (von Bertalanffy, Gompertz, logistic, and power) were fitted to mean length-at-age data. The von Bertalanffy growth model was selected by AICc as the best approximating model, and data also provided some evidence …
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Spatial Allocation, Imputation, and Sampling Methods for Timber Product Output Data
… the total. Finally, nonlinear repeated measures models were developed to spatially allocate mill receipts to surrounding counties in the event of obtaining only a mill's total receipt volume. A Gompertz model with a power spatial covariance was found to be the best performing when using road …
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Effect of different production practices on the development of verticillium wilt and cotton fiber quality
… cultivar. When characterizing temporal progress, Gompertz, logistic, and exponential models were better fit than the linear model. Among these nonlinear growth models, the Gompertz model was determined to be the best fitting model for simulating the Verticillium wilt epidemics. Disease incidence …
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Impacts of low-water activity food type on inactivation kinetics and models of foodborne pathogens treated with low-temperature, vacuum-assisted steam processing
… to remove pathogen contamination from LWAF, modeling the inactivation of such treatments, and studying the thermal resistances of two E. coli strains in low-water activity solutions. Low-temperature, vacuum-assisted steam (vacuum-steam) was evaluated as a potential intervention and preventive …
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Ecosystem Models in a Bayesian State Space Framework
… being used to embed mechanistic process models used into statistical state space frameworks for environmental prediction and forecasting applications. In this study, I focus on Bayesian State Space Models (SSMs) for modeling the temporal dynamics of carbon in terrestrial ecosystems. In …