Browsing Workspace (UPSpace) by UP Author "Ferreira, Johannes Theodorus"

Browsing Workspace (UPSpace) by UP Author "Ferreira, Johannes Theodorus"

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  • Alternative dirichlet priors for estimating entropy via a power sum functional 
    Botha, Tanita; Ferreira, Johannes Theodorus; Bekker, Andriette, 1958- (MDPI, 2021-06-25)
    Entropy is a functional of probability and is a measurement of information contained in a system; however, the practical problem of estimating entropy in applied settings remains a challenging and relevant problem. The ...
  • Capturing a change in the covariance structure of a multivariate process 
    Bekker, Andriette, 1958-; Ferreira, Johannes Theodorus; Human, Schalk William; Adamski, Karien (MDPI, 2022-01-13)
    This research is inspired from monitoring the process covariance structure of q attributes where samples are independent, having been collected from a multivariate normal distribution with known mean vector and unknown ...
  • A noncentral Lindley construction illustrated in an INAR(1) environment 
    Ferreira, Johannes Theodorus; Van der Merwe, Ane (MDPI, 2022-01)
    This paper proposes a previously unconsidered generalization of the Lindley distribution by allowing for a measure of noncentrality. Essential structural characteristics are investigated and derived in explicit and ...
  • Reflecting on the viability of Twitter as tool in the postgraduate supervision process 
    Ferreira, Johannes Theodorus (Frontiers Media, 2021-09-06)
    Much has been written on the implementation of Twitter in the higher education environment, but few essays exist on the role that this social media space could potentially fulfill in the postgraduate supervision process. ...
  • Tsallis and other generalised entropy forms subject to Dirichlet mixture priors 
    Ferreira, Johannes Theodorus; Botha, Tanita; Bekker, Andriette, 1958- (MDPI, 2022-05-28)
    Entropy indicates a measure of information contained in a complex system, and its estimation continues to receive ongoing focus in the case of multivariate data, particularly that on the unit simplex. Oftentimes the ...