Browsing Research Articles (Statistics) by UP Author "De Villiers, Johan Pieter"

Browsing Research Articles (Statistics) by UP Author "De Villiers, Johan Pieter"

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  • Evaluation of a pure-strategy Stackelberg game for wildlife security in a geospatial framework 
    Kirkland, Lisa-Ann; De Waal, Alta; De Villiers, Johan Pieter (Springer, 2020-12)
    Current research on wildlife security games has minimal focus on performance evaluation. The performance of the rangers is evaluated by assessing their game utility, sometimes in comparison with their maximin utility, and ...
  • An expert-driven causal model of the rhino poaching problem 
    Koen, Hildegarde; De Villiers, Johan Pieter; Roodt, Henk; De Waal, Alta (Elsevier, 2017-03)
    A significant challenge in ecological modelling is the lack of complete sets of high-quality data. This is especially true in the rhino poaching problem where data is incomplete. Although there are many poaching attacks, ...
  • A Gamma-Poisson mixture topic model for short text 
    Mazarura, Jocelyn; De Waal, Alta; De Villiers, Johan Pieter (Hindawi Publishing, 2020-04-29)
    Most topic models are constructed under the assumption that documents follow a multinomial distribution. The Poisson distribution is an alternative distribution to describe the probability of count data. For topic modelling, ...