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Browsing Department of Mathematics by Issue Date

Browsing Department of Mathematics by Issue Date

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  • Abuzaid, Ali (Statistics in Medicine, 2020-05-19)
    This article is considered to be the first to deal with the problem of outlier‐detection in multivariate circular data. The proposed algorithm is an extension of the Local Outlier Factor (LOF) method. Two different circular ...
  • Abuzaid, Ali (Statistics in Transition New Series, 2020-09-01)
    The problem of outlier detection in univariate circular data was the object of increased interest over the last decade. New numerical and graphical methods were developed for samples from different circular probability ...
  • Abuzaid, Ali; Mahdi, E; Atta, A (Communications for Statistical Applications and Methods, 2020-09-30)
    Modeling the statistical autocorrelations in spatial data is often achieved through the estimation of the variograms, where the selection of the appropriate valid variogram model, especially for small samples, is crucial ...
  • Abuzaid, Ali; Alshqaq, Shokrya (Taylor and Francis, 2021-02-11)
    This article proposes robust versions of Mallows’ Cp criterion to select the best variables for a multiple linear regression model with a small number of variables in the presence of outliers. The robustness measures ...
  • Abuzaid, Ali; El Shekh Ahmed, H (ISOSS Publications, 2021-04-26)
    The modeling of the relationship between a binary variable and circular variables has not been well investigated yet. This article considers the problem of outliers’ detection in the circular logistic regression model; ...
  • Abuzaid, Ali; Alshqaq, Shokrya; Ahmadini, Abdullah (Hindawi, 2021-05-26)
    Maximum likelihood estimation (MLE) is often used to estimate the parameters of the circular logistic regression model due to its efficiency under a parametric model. However, evidence has shown that the classical MLE ...
  • Abuzaid, Ali; Alshqaq, Shokrya; Ahmadini, Abdullah (Elsevier, 2021-08-19)
    The problem of robust estimation in circular regression models has not been studied well. This paper considers the JS circular regression model due to its interesting properties and its sensitivity for existence and detection ...
  • Jamal, Farrukh; Abuzaid, Ali; Tahir, Muhammad H.; Nasir, Muhammad Arslan; Khan, Sadaf; Mashwani, Wali Khan (MDPI, 2021-12-15)
    In this article, Burr III distribution is proposed with a significantly improved functional form. This new modification has enhanced the flexibility of the classical distribution with the ability to model all shapes of ...

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