Articles by Keyword: Mixed Effects Model

Search results for Mixed Effects Model

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  1. Generic linear mixed-effects individual-tree biomass models for <em>Pinus massoniana</em> in southern China

    Generic linear mixed-effects individual-tree biomass models for <em>Pinus massoniana</em> in southern China

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Quantification of forest biomass is important for practical forestry and for scientific purposes. It is fundamental to develop generic individual-tree biomass models suitable for large-scale forest biomass estimation. However, compatibility of forest biomass estimates at different scales may become a...
  2. Modelling primary branch growth based on a multilevel nonlinear mixed‑effects model: a <em>Pinus koraiensis</em> plantation case study in north‑east China

    Modelling primary branch growth based on a multilevel nonlinear mixed‑effects model: a <em>Pinus koraiensis</em> plantation case study in north‑east China

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    On the basis of a multilevel nonlinear mixed‑effects model approach, branch diameter and length growth models were developed for a Pinus koraiensis plantation in north‑east China. The models developed were able to better capture the residual variation successfully by partitioning...
  3. Population fluctuations of <em>Cerithidea decollata</em> (Gastropoda: Potamididae) in mangrove habitats of the St Lucia Estuary, South Africa

    Population fluctuations of <em>Cerithidea decollata</em> (Gastropoda: Potamididae) in mangrove habitats of the St Lucia Estuary, South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Mangrove macrobenthos species are used as ecological indicators as they are sensitive to changes in sediment properties. In this study, the population density of the common mangrove whelk Cerithidea decollata was assessed during different environmental conditions in the St Lucia...
  4. Stability analysis of grain yield of tef (<em>Eragrostis tef</em>) using the mixed model approach

    Stability analysis of grain yield of tef (<em>Eragrostis tef</em>) using the mixed model approach

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Multi-environment trials are usually used to assess the grain yield stability of genotypes. Most of the common stability measures such as Finlay and Wilkinson (1963), Eberhart and Russell (1966) and Shukla (1972), can be accommodated by a linear mixed model...
  5. Growth models for <em>Pinus patula</em> in Angola

    Growth models for <em>Pinus patula</em> in Angola

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    This study developed growth models for Pinus patula Schiede ex Schltdl. et Cham. for the Central Highlands of Angola for simulating the development of stand characteristics. The model set included dominant height, individual-tree diameter increment, individual-tree height and self-thinning models...
  6. Stand basal area model for <em>Cunninghamia lanceolata</em> (Lamb.) Hook. plantations based on a multilevel nonlinear mixed-effect model across south-eastern China

    Stand basal area model for <em>Cunninghamia lanceolata</em> (Lamb.) Hook. plantations based on a multilevel nonlinear mixed-effect model across south-eastern China

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Based on a multilevel nonlinear mixed-effect model approach, a stand basal area model was developed for Cunninghamia lanceolata (Lamb.) Hook. plantations belonging to the National Forest Inventory in China. The database consists of 583 plots embracing 18 different blocks within...
  7. A Bayesian state-space model for mixed-stock migrations, with application to Northeast Atlantic mackerel <em>Scomber scombrus</em>

    A Bayesian state-space model for mixed-stock migrations, with application to Northeast Atlantic mackerel <em>Scomber scombrus</em>

    Item type: Journal Article • Journal: African Journal of Marine Science
    Management of fisheries that exploit mixed-stock populations relies on assumptions made concerning stock structure and mixing in different areas. To address the problems of accounting for uncertainty when formulating scientific advice for the management of highly migratory fish stocks, management...
  8. Tree taper models for <em>Cupressus lusitanica</em> plantations in Ethiopia

    Tree taper models for <em>Cupressus lusitanica</em> plantations in Ethiopia

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    To provide a taper model for planning and management of Cupressus lusitanica plantations in Ethiopia, seven taper models were compared. Four performance indicator statistics were used for comparing the models in their ability to estimate tree diameter, and total and...
  9. Growth models for six <em>Eucalyptus</em> species in Angola

    Growth models for six <em>Eucalyptus</em> species in Angola

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    This study developed growth models for Eucalyptus saligna Sm., E. camaldulensis Dehnh., E. macarthurii H.Deane & Maiden, E. resinifera Sm., E. siderophloia Benth. and E. grandis Hill ex. Maiden, for the central highlands of Angola, and used these models to...
  10. Sharks caught in the KwaZulu-Natal bather protection programme, South Africa. 13. The tiger shark <em>Galeocerdo cuvier</em>

    Sharks caught in the KwaZulu-Natal bather protection programme, South Africa. 13. The tiger shark <em>Galeocerdo cuvier</em>

    Item type: Journal Article • Journal: African Journal of Marine Science
    The current study provides long-term catch rate and biological data for tiger sharks Galeocerdo cuvier caught in the KwaZulu-Natal bather protection programme. Between 1978 and 2014, 1 760 G. cuvier were caught in nets and between 2007 and 2014, 108...