Chénangnon Frédéric Tovissodé

Chénangnon Frédéric Tovissodé
University of Abomey-Calavi | UAC · Laboratoire de Biomathématiques et d'Estimations Forestières (LABEF)

Doctor in Biometry

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27
Publications
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124
Citations

Publications

Publications (27)
Preprint
The normal and Poisson distribution assumptions in the normal-Poisson mixed effects regression model are often too restrictive for many real count data. Several works have independently relaxed the Poisson conditional distribution assumption for counts or the normal distribution assumption for random effects. This work couples some recent advances...
Article
Full-text available
The widely used logistic model for epidemic case reporting data may be either restrictive or unrealistic in presence of containment measures when implemented after an epidemic outbreak. For flexibility in epidemic case reporting data modeling, we combined an exponential growth curve for the early epidemic phase with a flexible growth curve to accou...
Preprint
Full-text available
Most existing flexible count regression models allow only approximate inference. Balanced discretization is a simple method to produce a mean-parametrizable flexible count distribution starting from a continuous probability distribution. This makes easy the definition of flexible count regression models allowing exact inference under various types...
Article
Full-text available
Binary Generalized Linear Mixed Model (GLMM) is the most common method used by researchers to analyze clustered binary data in biological and social sciences. The traditional approach to GLMMs causes substantial bias in estimates due to steady shape of logistic and normal distribution assumptions thereby resulting into wrong and misleading decision...
Preprint
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It is quite easy to stochastically distort an original count variable to obtain a new count variable with relatively more variability than in the original variable. Many popular overdispersion models (variance greater than mean) can indeed be obtained by mixtures, compounding or randomlystopped sums. There is no analogous stochastic mechanism for t...
Preprint
The widely used logistic model for epidemic case reporting data may be either restrictive or unrealistic in presence of containment measures when implemented after an epidemic outbreak. For flexibility in epidemic case reporting data modelling, we combined an exponential growth curve for the early epidemic phase with a flexible growth curve to acco...
Article
Full-text available
Most existing flexible count distributions allow only approximate inference when used in a regression context. This work proposes a new framework to provide an exact and flexible alternative for modeling and simulating count data with various types of dispersion (equi-, under-, and overdispersion). The new method, referred to as “balanced discretiz...
Preprint
Full-text available
The widely used logistic model for epidemic case reporting data may be either restrictive or unrealistic in presence of containment measures when implemented after an epidemic outbreak. For flexibility in epidemic case reporting data modelling, we combined an exponential growth curve for the early epidemic phase with a flexible growth curve to acco...
Preprint
Full-text available
Most existing flexible count regression models allow only approximate inference. This work proposes a new framework to provide an exact and flexible alternative for modeling and simulating count data with various types of dispersion (equi-, under- and overdispersion). The new method, referred as “balanced discretization”, consists in discretizing c...
Article
Full-text available
Background and aims-Geographic patterns of phenotypic variability can inform understanding of the resilience potential of plant species to environmental hazards such as climate change. Such understanding provides support for conservation and domestication efforts. Here, we investigated natural morphological variation of the individuals, fruits, see...
Preprint
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Afin de guider les étudiants et les professionnels dans le choix du type de moyenne appropriée pour une variable aléatoire, une définition opérationnelle de la valeur moyenne a été proposée dans Kpenavoun Chogou (2020). Cette note clarifie les sous-entendus de la définition opérationnelle proposée en partant de la définition mathématique formelle d...
Article
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The initial phase dynamics of an epidemic without containment measures is commonly well modelled using exponential growth models. However, in the presence of containment measures , the exponential model becomes less appropriate. Under the implementation of an isolation measure for detected infectives, we propose to model epidemic dynamics by fittin...
Preprint
Full-text available
The initial phase dynamics of an epidemic without containment measures is commonly well modeled using exponential growth models. However, in the presence of containment measures, the exponential model becomes less appropriate. Under the implementation of an isolation measure for detected infectives, we propose to model epidemic dynamics by fitting...
Article
Moringa oleifera Lam. is an agroforestry species grown for its various uses. Despite its great socio-economic importance, the species is still not well exploited and considered as a neglected and underutilised species. This study aimed at identifying the morphotypes of M. oleifera and assessing how they were related to climatic conditions and farme...
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Background: Eliciting factors affecting distribution of traditional knowledge (TK) and cultural importance of plant resources is central in ethnobiology. Socio-demographic attributes and ecological apparency hypothesis (EAH) have been widely documented as drivers of TK distribution, but their synergistic effect is poorly documented. Here, we focus...
Article
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Rural populations are closely dependent on plant resources for their daily needs. Fruit productivity of these species is an indicator of their economic potential and their capacity to regenerate. This is also fundamental to define sustainable management strategies of species. The present study assessed the fruits and seeds productivity of four fore...
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Abstract- Introduction. This study was set-up to assess the local perception on morphological differentiation within sweet African bush mango tree (Irvingia gabonensis) in southwestern Benin. Materials and methods. Locally acknowledged morphotypes (LAM) and local differentiation criteria were determined, using group discussions with 60 farmers. A t...
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Synsepalum dulcificum (Schumach. & Thonn. Daniell) est un arbuste originaire de l’Afrique de l’Ouest, inscrit sur la liste des espèces vulnérables de l’UICN. Au Bénin, son importance pour les populations locales reste peu documentée. L’étude avait pour objectif d’évaluer les connaissances endogènes, la valeur d’usage et l’importance économique de l...
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Full-text available
Synsepalum dulcificum (Schumach. & Thonn. Daniell) is a West African shrub which is listed as vulnerable by the IUCN. Its importance for local people in Benin has been little documented. This study takes up this issue and was carried out to assess local knowledge, use value and the economic importance of the species for local people. Ethnobotanical...
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Cette étude s'est appesantie sur les approches socio-culturelles et cultuelles de certaines plantes dans la vie des populations des communautés béninoises. Au cours de ces entrevues, les répondants ont été interrogés sur l'utilisation de N. laevis et d'autres plantes. Les données obtenues ont été compilées et analysées pour constituer une base de d...
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Traditional knowledge (TK), use, and economical values of three bamboo species—Oxytenanthera abyssinica (A.Rich.) Munro, Bambusa vulgaris Schrad. ex J.C.Wendl., and Dendrocalamus asper (Schult. & Schult. f.) Backer ex K.Heyne—were assessed in southeastern Benin. Individual interviews were used in 90 randomly selected villages, which cut across 10 s...
Article
Full-text available
A study was carried out in two phytodistricts (Ouémé-Valley and Plateau) to assess the population structure of two bamboo species (Oxytenanthera abyssinica (A. Rich.) Munro and Bambusa vulgaris Schrad. ex J.C. Wendl.) in two topographical units: plateau and wetlands. In each phytodistrict bamboo stands were randomly selected in each topographical u...

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Projects (2)
Project
The project aims at contributing to the effective domestication of M. oleifera in West Africa