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Development of Bayesian stock assessment methods for Namibian orange roughy Hoplostethus atlanticus
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: M. K. McAllister C. H. KirchnerBayesian methods are useful in fisheries stock assessment because they provide a conceptually elegant and statistically rigorous approach to making decisions under uncertainty. The application of Bayesian stock assessment methods in the management of Namibian orange roughy Hoplosthethus atlanticus within... -
Is Theism a Simple, and hence Probable, Explanation for the Universe?
Item type: Journal Article • Journal: South African Journal of Philosophy • Authors: John Ostrowick --- Philosophy Department, University of Cape Town,Richard Swinburne, in his The Existence of God (2004), presents a cosmological argument in defence of theism (Swinburne 1991: 119, 135). God, Swinburne argues, is more likely to bring about an ordered universe than other states (ibid.: 144, 299). To... -
Assessing stocks in data-poor African fisheries: a case study on the white grouper Epinephelus aeneus of Mauritania
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: B Meissa --- , Mauritanie D Gascuel --- , France E Rivot --- , FranceThe lack of reliable stock assessment for numerous exploited stocks in West Africa often results from poor-quality data, high multi-specificity of captures, and the heterogeneity of exploitation methods. However, many signs of overexploitation exist, particularly for demersal resources, highlighting the... -
A Bayesian state-space model for mixed-stock migrations, with application to Northeast Atlantic mackerel Scomber scombrus
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CL Cunningham DG Reid MK McAllister GP Kirkwood CD DarbyManagement 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... -
Evaluating diagnostic tests
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Johan F. Coetzee --- Department of Anaesthesiology and Critical Care, South AfricaAnaesthesiologists are increasingly more involved in perioperative patient care wherein interpretation of special investigations is crucial to making therapeutic and prognostic decisions. Furthermore, anaesthetic journal publications increasingly rely on diagnostic tests, without paying sufficient attention to the methodology for evaluation... -
A Review of Systematic Risk Estimation on the JSE
Item type: Journal Article • Journal: De Ratione • Authors: D C Bowie --- University of Cape Town, D J Bradfield --- University of Cape Town,This paper reviews some recent developments in the area of beta estimation on the JSE. it turns out that the dual phenomena of extreme thin trading and mild segmentation between the industrial and mining boards on the JSE impact on... -
Spatial pattern and determinants of unmet need of family planning in Nigeria
Item type: Journal Article • Journal: South African Family Practice • Authors: Oluwayemisi Oyeronke Alaba --- Department of Statistics, Nigeria JO Olaomi --- Department of Statistics, South Africa Olusanya E. Olubusoye --- Department of Statistics, NigeriaBackground: Nigeria still grapples with low family planning (FP) use and a high fertility rate. This study explores the factors associated with the unmet need for FP and the coldspots of unmet need for FP in Nigeria. -
Review and empirical comparison of joint mapping of multiple diseases
Item type: Journal Article • Journal: Southern African Journal of Epidemiology and Infection • Authors: Samuel Manda --- Biostatistics Unit, South African Medical Research Council, South Africa Richard Feltbower --- Centre for Epidemiology and Biostatistics, Leeds Institute of Genetics and Therapeutics, University of Leeds, United Kingdom Mark Gilthorpe --- Centre for Epidemiology and Biostatistics, Leeds Institute of Genetics and Therapeutics, University of Leeds, United KingdomThere has been a substantial amount of recent modelling work in multivariate disease-mapping models in epidemiology. These models provide information on similarities, as well as differences, on the effect of risk factors among diseases. Additionally, they can be used to... -
Using stable isotope analysis to study the diet of Gilchristella aestuaria larvae: preliminary insights into the foodwebs of six South African estuaries
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D Costalago --- Department of Ecology, Environment and Plant Sciences, Sweden NAF Miranda --- DST/NRF Research Chair in Shallow Water Ecosystems, Department of Zoology, South Africa NA Strydom --- Department of Zoology, South Africa R Perissinotto --- DST/NRF Research Chair in Shallow Water Ecosystems, Department of Zoology, South AfricaSouth African estuarine systems are becoming increasingly altered by anthropogenic and environmental factors, but the consequences of such changes for these systems are still not fully understood. The most common approach for evaluating the ecological status of aquatic systems is... -
Spatial patterns and determinants of fertility levels among women of childbearing age in Nigeria
Item type: Journal Article • Journal: South African Family Practice • Authors: Oluwayemisi O Alaba --- Department of Statistics, Nigeria Olusanya E Olubusoye --- Department of Statistics, South Africa JO Olaomi --- Department of Statistics, South AfricaBackground: Despite aggressive measures to control the population in Nigeria, the population of Nigeria still remains worrisome. Increased birth rates have significantly contributed to Nigeria being referred to as the most populous country in Africa. This study analyses spatial patterns... -
Ecology and behaviour of Palm-nut Vultures Gypohierax angolensis in the Bijagós Archipelago, Guinea-Bissau
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Camilo Carneiro --- Department of Biology and CESAM, Portugal Mohamed Henriques --- Faculty of Sciences, Portugal Castro Barbosa --- Institute of Biodiversity and Protected Areas of Guinea-Bissau, Guinea-Bissau Quintino Tchantchalam --- Institute of Biodiversity and Protected Areas of Guinea-Bissau, Guinea-Bissau Aissa Regalla --- Institute of Biodiversity and Protected Areas of Guinea-Bissau, Guinea-Bissau Ana R Patrício --- Centre for Ecology and Conservation, UK Paulo Catry --- MARE – Marine and Environmental Sciences Centre, PortugalPopulations of many vulture species have undergone substantial declines. In Africa, 82% are threatened and although research on vultures has increased, the biology and ecology of several species is still poorly known. The Palm-nut Vulture Gypohierax angolensis has peculiar ecological... -
The status and conservation of the Cape Gannet Morus capensis
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Richard B Sherley --- Environment and Sustainability Institute/Centre for Ecology and Conservation, United Kingdom Robert JM Crawford --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Bruce M Dyer --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Jessica Kemper --- African Penguin Conservation Project, Namibia Azwianewi B Makhado --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Makhudu Masotla --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Lorien Pichegru --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Pierre A Pistorius --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Jean-Paul Roux --- Ministry of Fisheries and Marine Resources, Namibia Peter G Ryan --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Desmond Tom --- Ministry of Fisheries and Marine Resources, Namibia Leshia Upfold --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Henning Winker --- Department of Environment, Forestry and Fisheries (DEFF), South AfricaThe Cape Gannet Morus capensis is one of several seabird species endemic to the Benguela upwelling ecosystem (BUS) but whose population has recently decreased, leading to an unfavourable IUCN Red List assessment. Application of ‘JARA’ (‘Just Another Red-List Assessment,’ a... -
Using stable δ13C and δ15N isotopes to assess foodweb structures in an African subtropical temporary pool
Item type: Journal Article • Journal: African Zoology • Authors: L de Necker --- Water Research Group, Unit for Environmental Sciences and Management, South Africa A Manfrin --- Environmental Campus Birkenfeld, Germany Y Ikenaka --- Water Research Group, Unit for Environmental Sciences and Management, South Africa M Ishizuka --- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Japan L Brendonck --- Water Research Group, Unit for Environmental Sciences and Management, South Africa JHJ van Vuren --- Water Research Group, Unit for Environmental Sciences and Management, South Africa B Sures --- Department of Aquatic Ecology and Centre for Water and Environmental Research (ZWU), Germany V Wepener --- Water Research Group, Unit for Environmental Sciences and Management, South Africa NJ Smit --- Water Research Group, Unit for Environmental Sciences and Management, South AfricaSouthern Africa has one of the highest densities of temporary pools and some of the most understudied temporary wetlands in the world. Additionally, the eastern African annual killifishes (Nothobranchius spp.) are rare in southern Africa and found exclusively in temporary... -
River water quality modelling and simulation based on Markov Chain Monte Carlo computation and Bayesian inference model
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mrunmayee Manjari Sahoo --- , India Kanhu Charan Patra --- , Rourkela, IndiaHierarchical Bayesian methods are experiencing increased use for probabilistic ecological modelling. Influence of water quality indicators in the river water are studied. Bayesian inference through Markov Chain Monte Carlo (MCMC) algorithm is used as the basic model to assess the... -
Bayesian forecasting of stock returns on the JSE using simultaneous graphical dynamic linear models
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Nelson Kyakutwika --- Stellenbosch University, South Africa Bruce Bartlett --- Stellenbosch University, South AfricaCross-series dependencies are crucial in obtaining accurate forecasts when forecasting a multivariate time series. Simultaneous Graphical Dynamic Linear Models (SGDLMs) are Bayesian models that elegantly capture cross-series dependencies. This study forecasts returns of a 40... -
The roadblocks to progress: A comprehensive study on the relationship between regional institutional quality and firms’ innovation of sub-Saharan African nations
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Abel Dula Wedajo --- University of Sanya, People’s Republic of China Xiao Huilin --- University of International Business and Economics (UIBE), People’s Republic of ChinaThis study examines the impact of regional institutional quality (level two) on firm-level innovation (level one) in Sub-Saharan Africa (SSA), where cultural and institutional diversity challenges frameworks derived from homogeneous contexts. Analyzing 7,578 firms across Ethiopia, Kenya, Rwanda, Tanzania, Uganda,...