American Journal of Theoretical and Applied Statistics

Volume 2, Issue 6, November 2013

  • Parameters Estimation Based on Progressively Censored Data from Inverse Weibull Distribution

    Mostafa M. MohieEl-Din, Fathy H. Riad, Mohamed A. El-Sayed

    Issue: Volume 2, Issue 6, November 2013
    Pages: 149-153
    Received: 4 September 2013
    Published: 30 September 2013
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    Abstract: In this article, our main aim is to investigate the parameters estimation of inverse Weibull distribution in the frame work of progressively type II. We consider the censored sample from a two parameters inverse Weibull. The point estimators of the parameters derived by using the maximum likelihood method. The exact joint confidence region and conf... Show More
  • Estimate of Subject Specific Index of Relative Performance in ‘K’ Samples

    Oyeka Ikewelugo Cyprian Anaene, Okeh Uchechukwu Marius

    Issue: Volume 2, Issue 6, November 2013
    Pages: 154-165
    Received: 18 September 2013
    Published: 20 October 2013
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    Abstract: This paper proposes and develops a statistic here termed the ‘relative performance index’ or the index of relative performance’ by subjects both within and between several sampled populations for preferentially rank-ordering subjects by their relative performance in comparison with other subjects from these populations involved in a test or contest... Show More
  • Method of Principal Factors Estimation of Optimal Number of Factors: An Information Criteria Approach

    Nwosu Dozie. F., Onyeagu Sidney. I., Osuji George A.

    Issue: Volume 2, Issue 6, November 2013
    Pages: 166-175
    Received: 24 September 2013
    Published: 30 October 2013
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    Abstract: The issue of the number of factors to be retained in a factor analysis has been an undefined. Be that as it may, this paper tries to x-ray the number of factors (k) to be retained in a factor analysis for different sample sizes using the method of Principal Factor estimation when the number of variables are ten (10). Stimulated data were used for s... Show More
  • Application of Multivariate Methods for Assessment of Variations in Rivers/Streams Water Quality in Niger State, Nigeria

    Audu Isah, Usman Abdullahi, Muhammed Muhammed Ndamitso

    Issue: Volume 2, Issue 6, November 2013
    Pages: 176-183
    Received: 25 September 2013
    Published: 10 November 2013
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    Abstract: Multivariate statistical methods, Cluster Analysis (CA) and Canonical Discriminant Analysis (CDA) were applied to assess the temporal and spatial variations, and identify pollution sources in some rivers/streams of Niger State in Nigeria. Sixteen towns were sampled as medium-sized towns in which data were gathered on four physical, eleven chemical ... Show More
  • Assessing the Knowledge, Attitude and Factors Affecting Team Building Amongst Health Workers in Nigeria Using the Permutation Method for Hotelling T-squared Analysis

    Aronu, C. O., Bilesanmi, A. O.

    Issue: Volume 2, Issue 6, November 2013
    Pages: 184-190
    Received: 2 October 2013
    Published: 10 November 2013
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    Abstract: This study is on assessing the knowledge, attitude and factors affecting team building activities amongst health workers in Nigeria. The objective of this study is to determine the equality on knowledge and attitude of team building activities between health workers of Anambra state and Delta State. The source of data for this study was questionnai... Show More
  • Method of Maximum Likelihood Estimation of Optimal Number of Factors: An Information Criteria Approach

    Nwosu F. Dozie, Onyeagu, Sidney I., Osuji, George A., Ekezie Dan Dan

    Issue: Volume 2, Issue 6, November 2013
    Pages: 191-201
    Received: 25 September 2013
    Published: 10 November 2013
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  • Comparative Study on Forecasting Accuracy among Moving Average Models with Simulation and PALTEL Stock Market Data in Palestine

    Samir K. Safi, Issam A. Dawoud

    Issue: Volume 2, Issue 6, November 2013
    Pages: 202-209
    Received: 9 October 2013
    Published: 10 November 2013
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    Abstract: In this paper, we discuss three analytical time series models for selecting the more effective with an accurate forecasting models, among others. We analytically modify the stochastic realization utilizing (i) k-th moving average, (ii) k-th weighted moving average, and (iii) k-th exponential weighted moving average processes. The examining methods... Show More
  • Multivariate Analysis of Data on the Effects of Different Vegetative Covers on Some Physical Properties of a Selected Nigerian Soil

    CHUKWUDI JUSTIN OGBONNA, OPARA JUDE, HYCINTH CHUKWUDI IWU

    Issue: Volume 2, Issue 6, November 2013
    Pages: 210-220
    Received: 22 October 2013
    Published: 10 November 2013
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    Abstract: This work discusses the use of multivariate analysis of variance to tackle the problem of investigating the effects of different vegetative covers on the physical properties of a selected Nigerian soil. An additive effect model was assumed and using data obtained from the Department of Soil Science of the University of Nigeria, Nsukka, we tested fo... Show More
  • Estimating the Fisher’s Scoring Matrix Formula from Logistic Model

    Okeh UM, Oyeka I. C. A.

    Issue: Volume 2, Issue 6, November 2013
    Pages: 221-227
    Received: 21 October 2013
    Published: 20 November 2013
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    Abstract: This paper proposes a matrix approach to estimating parameters of logistic regression with a view to estimating the effects of risk factors of gestational diabetic mellitus (GDM). The proposed method of maximum likelihood estimation (MLE) unlike other methods of estimating parameters of non-linear regression is simpler and convergence of parameters... Show More
  • Statistical Analysis of Life-Time and Temperature of Black Holes

    Ved Prakash, Dipo Mahto, Ashok Kumar, Basant Kumar Das

    Issue: Volume 2, Issue 6, November 2013
    Pages: 228-232
    Received: 4 November 2013
    Published: 30 November 2013
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    Abstract: In the present article, statistical analysis of lifetime and temperature of the black holes have been studied existing in X-ray binaries and active galactic nuclei with the help of formula Г = (M/Mʘ)3 x 1066 years and T=hc3/8πkGM Kelvin respectively where M stands for the mass of black hole and other parameters have their usual meaning.
  • Comparison of Statistical Methods for Outlier Detection in Proficiency Testing Data on Analysis of Lead in Aqueous Solution

    Sushree Swarupa Tripathy, Rajiv Kumar Saxena, Prabhat Kumar Gupta

    Issue: Volume 2, Issue 6, November 2013
    Pages: 233-242
    Received: 5 November 2013
    Published: 10 December 2013
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    Abstract: Proficiency testing is the regular testing of the performance of individual laboratories by an external agency. Stable and effectively homogeneous elemental solutions of different concentrations ranging were prepared at NPL and were certified by round robin test. These certified reference materials (CRMs) along with reports containing all informati... Show More
  • Phenol Removal via Advanced Oxidative Processes (O3/Photo-Fenton) and Chemometrics

    Ana Paula Barbosa Rodrigues de Freitas, Leandro Valim de Freitas, Hélcio José Izário Filho, Messias Borges Silva

    Issue: Volume 2, Issue 6, November 2013
    Pages: 243-247
    Received: 7 November 2013
    Published: 10 December 2013
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    Abstract: Taguchi’s L16 orthogonal array in the study of removal of total phenols using advanced oxidation processes was efficient. In the statistical assessment, the input variables obtained as significant through ANOVA were: hydrogen peroxide (F = 10.0924 and p-value = 5.02) and ozone (F = 3.8686 and p-value = 14.39). In this assessment, the best experimen... Show More
  • A Comparative Study between Ridit and Modified Ridit Analysis

    Ebuh Godday Uwawunkonye, Oyeka Ikewelugo Cyprian Anaene

    Issue: Volume 2, Issue 6, November 2013
    Pages: 248-254
    Received: 2 November 2013
    Published: 10 December 2013
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    Abstract: This paper compares ridit analysis with modified ridit analysis. The comparison was then illustrated with an example. It was observed from the example at least, that when the sample sizes of the two samples being compared are too disparate, a more reliable conclusion using the Bross ridit analysis is likely to be reached only when the group with th... Show More
  • Investigating Predictors of Examination Result Data Using Logistic Regression (A Case Study of Imo State Polytechnic, Umuagwo, Imo State, Nigeria)

    Opara Jude, Esemokumo Perewarebo Akpos, Iheagwara Andrew Ihuoma, Okenwe Idochi, OSUJI GEORGE A.

    Issue: Volume 2, Issue 6, November 2013
    Pages: 255-267
    Received: 5 December 2013
    Published: 20 December 2013
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    Abstract: This study tends to analyze the school examination results (scores) of 300 randomly selected students of Imo State Polytechnic, Umuagwo near Owerri, Imo State, Nigeria who offer English Language and Mathematics as general courses, using the binary logistic regression model with the aim of examining how some factors (variables) in secondary school l... Show More
  • Derivation of Inflection Points of Nonlinear Regression Curves - Implications to Statistics

    Ayele Taye Goshu, Purnachandra Rao Koya

    Issue: Volume 2, Issue 6, November 2013
    Pages: 268-272
    Received: 19 December 2013
    Published: 10 January 2014
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    Abstract: In this paper, we derive inflection points for the commonly known growth curves, namely, generalized logistic, Richards, Von Bertalanffy, Brody, logistic, Gompertz, generalized Weibull, Weibull, Monomolecular and Mitscherlich functions. The functions often represent the mean part of non-linear regression models in Statistics. Inflection point of a ... Show More
  • Intrinsically Ties Adjusted Tau (C-Tat) Correlation Coefficient

    OYEKA CYPRIL ANENE, OSUJI GEORGE AMAEZE, NWANKWO CHRISTIAN CHUKWUEMEKA

    Issue: Volume 2, Issue 6, November 2013
    Pages: 273-281
    Received: 23 November 2013
    Published: 10 January 2014
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    Abstract: This paper proposes a method for correcting and adjusting the usual or regular estimates of Tau correlation coefficients for the possibility of ties within and between observations in the population being correlated. The index here called C-Tat for ‘ties adjusted Tau correlation coefficient’ is formulated to intrinsically and structurally adjust an... Show More
  • Graphical and Queuing Model of Banking Operations in Intercontinental Bank Plc, Nigeria

    Hycinth Chukwudi Iwu, Chukwudi Justin Ogbonna, Opara Jude

    Issue: Volume 2, Issue 6, November 2013
    Pages: 282-292
    Received: 21 December 2013
    Published: 10 January 2014
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    Abstract: This study is aimed at modeling the influence and network relationship existing amongst members of staff of commercial banks. It also solved the problem of profit maximization through staff reduction in a commercial banking system. In this paper, graph and queuing theories were applied in achieving the smooth running of the operations in a commerci... Show More
  • A New Criterion for Lag-Length Selection in Unit Root Tests

    Agunloye, Oluokun Kasali, Arnab, Raghunath, Shangodoyin, Dahud Kehinde

    Issue: Volume 2, Issue 6, November 2013
    Pages: 293-298
    Published: 30 January 2014
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    Abstract: This paper examines lag selection problem in unit root tests which has become a major specification problem in empirical analysis of non-stationary time series data. It is known that the implementation of unit root tests requires the choice of optimal truncation lag for good power proper ties and it is equally unrealistic to assume that the true op... Show More