Science Journal of Applied Mathematics and Statistics

Volume 5, Issue 4, August 2017

  • Prediction of Survival of HIV/AIDS Patients from Various Sources of Data Using AFT Models

    Markos Abiso Erango, Ayele Taye Goshu

    Issue: Volume 5, Issue 4, August 2017
    Pages: 127-133
    Received: 28 April 2017
    Accepted: 16 May 2017
    Published: 7 July 2017
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    Abstract: The aim of this paper is to predict and compare the survival of HIV/AIDS patients under ART follow-up in three different hospitals in Ethiopia. Three data sets with total 1304 patients were considered. Three parametric accelerated failure time distributions: lognormal, loglogistic and Weibull are used to analyze, predict and compare survival probab... Show More
  • Generalized Linear Models of Malaria Incidence in Jubek State, South Sudan

    Loro Gore Lado Jumi

    Issue: Volume 5, Issue 4, August 2017
    Pages: 134-138
    Received: 8 May 2017
    Accepted: 20 May 2017
    Published: 7 July 2017
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    Abstract: Malaria is a leading cause of morbidity and mortality in South Sudan. This study is meant to focus on the trend of malaria incidence in Jubek state, South Sudan. Data on weekly malaria incidence for the period January 2011 to October 2015 were used in the study. Generalized linear models, Poisson and negative binomial regression models were employe... Show More
  • Variational Principles of Fuzzy Mappings and Its Applications

    Yu-E Bao, Ying-Chun Niu, Yuan Li

    Issue: Volume 5, Issue 4, August 2017
    Pages: 139-146
    Received: 19 July 2017
    Published: 19 July 2017
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    Abstract: In this paper, we firstly discuss the basic properties of the sub differential of fuzzy mapping and get some related conclusions. Secondly, we establish a variational principle of fuzzy mapping by establishing the concept of gauge fuzzy mapping. Then we prove the approximation sun rule of fuzzy mapping in sub-differential as the application of that... Show More
  • On Maximum Likelihood Estimation for the Three Parameter Gamma Distribution Based on Left Censored Samples

    Etienne Ouindllassida Jean Ouédraogo, Blaise Somé, Simplice Dossou-Gbété

    Issue: Volume 5, Issue 4, August 2017
    Pages: 147-163
    Received: 30 May 2017
    Accepted: 14 June 2017
    Published: 24 July 2017
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    Abstract: This paper deals with a Maximum likelihood method to fit a three-parameter gamma distribution to data from an independent and identically distributed scheme of sampling. The likelihood hinges on the joint distribution of the n − 1 largest order statistics and its maximization is done by resorting to a MM-algorithm. Monte Carlo simulations is perfor... Show More
  • The Application of Binary Logistic Regression Analysis on Staff Performance Appraisal

    Runyi Emmanuel Francis

    Issue: Volume 5, Issue 4, August 2017
    Pages: 164-168
    Received: 5 June 2017
    Accepted: 14 June 2017
    Published: 26 July 2017
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    Abstract: This study investigates and models salient factors that influences the performance of staff in an appraisal exercise and as well estimate the odds of these factors influencing the outcome variable (performance rating) as compared to their reference group or category. The Binary Logistic regression model was used to estimate chance of the staff give... Show More