American Journal of Theoretical and Applied Statistics

Volume 8, Issue 6, November 2019

  • Demonstrating the Performance of Accelerated Failure Time Model Over Cox-PH Model of Survival Data Analysis with Application to HIV-Infected Patients Under HAART

    Getnet Bogale Begashaw

    Issue: Volume 8, Issue 6, November 2019
    Pages: 193-202
    Received: 3 May 2019
    Accepted: 24 October 2019
    Published: 31 October 2019
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    Abstract: Human Immunodeficiency Virus (HIV) is a virus that kills CD4 cells. These CD4 cells are white blood cells that fight infection. CD4 count is like a snapshot of how well our immune system is functioning. Studying the way of CD4+ count over time provides an insight to the disease evolution. This study was considering the data of HIV/AIDS patients who... Show More
  • Errors of Misclassification Associated with Edgeworth Series Distribution (ESD)

    Awogbemi Clement Adeyeye, Onyeagu Sidney Iheanyi

    Issue: Volume 8, Issue 6, November 2019
    Pages: 203-213
    Received: 2 March 2018
    Accepted: 30 March 2018
    Published: 8 November 2019
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    Abstract: This study investigates the errors of misclassification associated with Edgeworth Series Distribution (ESD) with a view to assessing the effects of sampling from non-normality. The effects of applying a normal classificatory rule when it is actually a persistent non-normal distribution were examined. These were achieved by comparing the errors of m... Show More
  • Determine Joint Factors that Affect Maternal Weight and Body Mass Index Among Pregnant Women in Ethiopia: A Bi-variate Analysis

    Melkamu Ayana Zeru, Kindu Kebede Gebre

    Issue: Volume 8, Issue 6, November 2019
    Pages: 214-220
    Received: 5 August 2019
    Accepted: 15 October 2019
    Published: 8 November 2019
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    Abstract: Introduction: A low maternal body mass index and sub-optimal weight gain during pregnancy are long recognized risk factors for delivery of infants too small for gestational age, low birth weight as well as to increase the risk of subsequent obesity and hypertension in the off- spring. Maternal body mass index and maternal weight is positively assoc... Show More
  • Modeling Mortality Rates Using Heligman-Pollard and Lee-Carter in Nigeria

    Yahaya Haruna Umar, Ugboh Joshua Chukwudi

    Issue: Volume 8, Issue 6, November 2019
    Pages: 221-239
    Received: 25 April 2019
    Accepted: 29 September 2019
    Published: 13 November 2019
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    Abstract: In recent years the need for accurate mortality statistics has been emphasized by researchers in planning, analyzing, monitoring and projection of health situations in the country. It helps the government and other health agencies initiate various programs that can improve life expectancy especially in developing countries like Nigeria. Given the i... Show More
  • A Statistical Comparison of NRHM 2007-08 and 2012-13 Survey Data

    Vikram Singh, Santosh Kumar Gupta, Jagdish Prasad

    Issue: Volume 8, Issue 6, November 2019
    Pages: 240-245
    Received: 11 June 2019
    Accepted: 15 August 2019
    Published: 15 November 2019
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    Abstract: Important of health in the process of economic and social development and improving the quality of life of our citizens, the Government of India has launched the National Rural Health Mission. District level Household and Facility survey DLHS-3 and DLHS-4 conducted by Ministry of Health and family Welfare of New Delhi and International Institute fo... Show More
  • Estimation of CPI of Some Sub-sahara African Countries: Panel Data Approach

    Oyekunle Janet Olufunmike, Ayoola Joshua Femi, Oyenuga Iyabode Favour, Masopa Adekunle Nurudeen, Adesiyan Adefowope Abdul Azeez

    Issue: Volume 8, Issue 6, November 2019
    Pages: 246-252
    Received: 13 July 2019
    Accepted: 31 October 2019
    Published: 15 November 2019
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    Abstract: One of the economic indicators that are necessary to provide information on the state and progress of country is the Consumer Price Index (CPI) which measures changes in the price of goods and services over a certain period of time. An effective monetary policy depends on the ability of economists to develop a reliable model that could understand t... Show More
  • Asymptotic Properties of Optimized Type CVaR Estimator for NA Random Variables

    Shanchao Yang, Yuting Wang, Xin Yang, Xiutao Yang

    Issue: Volume 8, Issue 6, November 2019
    Pages: 253-260
    Received: 8 October 2019
    Accepted: 9 November 2019
    Published: 25 November 2019
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    Abstract: VaR and CVaR are important risk measures, which are widely used in finance, economy, insurance and other fields. However, VaR is not a coherent risk quantity, and it is not sufficient to measure tail risk. CVaR (also known as expected shortfall, ES) is a coherent risk measure, and it makes up for the defect that VaR is not enough to measure tail ri... Show More
  • Applying Survival Analysis to Telecom Churn Data

    Melik Masarifoglu, Ali Hakan Buyuklu

    Issue: Volume 8, Issue 6, November 2019
    Pages: 261-275
    Received: 12 February 2018
    Accepted: 5 March 2018
    Published: 2 December 2019
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    Abstract: In competitive telecommunication environment, it is imperative to maintain an effective customer retention strategy even while mobile service operators attracting new customers. Not only acquiring new customers costly process, but successful customer retention helps build brand loyalty and good business reputation. Motivated by real mobile service ... Show More
  • Volatility of Internally Generated Revenue and Effects of Its Major Components: A Case of Akwa Ibom State, Nigeria

    Usoro Anthony Effiong, John Eme Eseme

    Issue: Volume 8, Issue 6, November 2019
    Pages: 276-286
    Received: 13 October 2019
    Accepted: 12 November 2019
    Published: 4 December 2019
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    Abstract: In this work, volatility of Internally Generated Revenue of Akwa Ibom State with the contributory effects of its components was the major interest. Autoregressive Conditional Heteroscedasticity ARCH (1) model adopted revealed volatility in the IGR. This motivated investigation of the components as contributory factors to the volatility. The OLS reg... Show More
  • Posterior Predictive Checks for the Generalized Pareto Distribution Based on a Dirichlet Process Prior

    Wilson Moseki Thupeng, Boikanyo Mokgweetsi, Thuto Mothupi

    Issue: Volume 8, Issue 6, November 2019
    Pages: 287-295
    Received: 14 October 2019
    Accepted: 4 December 2019
    Published: 25 December 2019
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    Abstract: Extreme value modelling is widely applied in situations where accurate assessment of the behavior of a process at high levels is needed. The inherent scarcity of extreme value data, the natural objective of predicting future extreme values of a process associated with modelling of extremes and the regularity assumptions required by the likelihood a... Show More
  • Kriging and Simulation in Gaussian Random Fields Applied to Soil Property Interpolation

    Tofik Mussa Reshid

    Issue: Volume 8, Issue 6, November 2019
    Pages: 296-305
    Received: 28 March 2019
    Accepted: 24 October 2019
    Published: 30 December 2019
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    Abstract: Spatial modeling is increasingly prominent in many fields of science as statisticians attempt to characterize variability of the processes that are spatially indexed. This paper shows that the Gaussian random field framework is useful for characterizing spatial statistics for soil properties. A sample of soil properties in 94 spatial locations are ... Show More