American Journal of Theoretical and Applied Statistics

Volume 7, Issue 4, July 2018

  • Interval Estimation of a P(X1 < X2) Model for Variables having General Inverse Exponential Form Distributions with Unknown Parameters

    N. A. Mokhlis, E. J. Ibrahim, D. M. Gharieb

    Issue: Volume 7, Issue 4, July 2018
    Pages: 132-138
    Received: Feb. 28, 2018
    Accepted: Mar. 26, 2018
    Published: May 03, 2018
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    Abstract: In this article the interval estimation of a P(X1 < X2) model is discussed when X1 and X2are non-negative independent random variables, having general inverse exponential form distributions with different unknown parameters. Different interval estimators are derived, by applying different approaches. A simulation study is performed to compare the esti... Show More
  • Statistical Assessment of Employee’s Turnover and Its Causes; In the Case of Moret and Jiru Wereda, North Shoa, Amhara, Ethiopia

    Natnael Mamuye

    Issue: Volume 7, Issue 4, July 2018
    Pages: 139-146
    Received: Mar. 17, 2018
    Accepted: Mar. 30, 2018
    Published: May 03, 2018
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    Abstract: The purpose of this study is to assess the employee turnover rate and cause in the case of Moret and Jiru Wereda. In light of this objective the study adopted quantitative and qualitative method of research approaches to test a series research hypothesis and subjective analysis respectively. Specifically, the study used survey of questionnaire anal... Show More
  • Bootstrap Confidence Interval for Model Based Sampling

    Thomas Mageto, John Motubwa

    Issue: Volume 7, Issue 4, July 2018
    Pages: 147-155
    Received: Mar. 28, 2018
    Accepted: Apr. 15, 2018
    Published: May 18, 2018
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    Abstract: The bootstrap approach to statistical inference in sample surveys is an area which has seen considerable development in the recent past. In model based approach to sample survey theory the main interest has been to overcome the problem of robustness under misspecifications. The bootstrap method under restrictive model specifications has been sugges... Show More
  • Regularized Nonlinear Least Trimmed Squares Estimator in the Presence of Multicollinearity and Outliers

    George Kemboi Kirui Keitany, Ananda Omutokoh Kube, Joseph Mutua Mutisya, Fundi Daniel Muriithi

    Issue: Volume 7, Issue 4, July 2018
    Pages: 156-162
    Received: Apr. 17, 2018
    Accepted: May 29, 2018
    Published: Jun. 29, 2018
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    Abstract: This study proposes a regularized robust Nonlinear Least Trimmed squares estimator that relies on an Elastic net penalty in nonlinear regression. Regularization parameter selection was done using a robust cross-validation criterion and estimation through Newton Raphson iteration algorthm for the oprimal model coefficients. Monte Carlo simulation wa... Show More
  • Risk Factors of Road Traffic Accidents and Its Severity in North Shewa Zone, Amhara Region, Ethiopia

    Bezarede Mekonnen

    Issue: Volume 7, Issue 4, July 2018
    Pages: 163-166
    Received: Jun. 08, 2018
    Accepted: Jul. 01, 2018
    Published: Jul. 23, 2018
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    Abstract: Ethiopia is a country with the largest number of road traffic accidents and fatality rate. Pedestrians and the disabled, children and the aged in particular, are the major victims of these accidents. The severity of road traffic crashes is also likely to be much greater in Africa than anywhere else. The major objective of this study was to identify... Show More