Volume 8, Issue 1 (2012) | Journal of Mathematics and Statistics

On Three-Way Unbalance Nested Analysis of Variance

Smaila S. Sanni — 2011-12-10

Journal of Mathematics and Statistics, Published online: 10 December 2011; doi:10.3844/jmssp.2012.1.14

Problem statement: In this study, we give a simple analytically tractable procedure for solving three-way unbalanced nested Analysis of Variance (ANOVA). In many realistic situations, unbalanced desig...

Transient MHD Mixed Double Diffusive Convection Along a Vertical Plate Embedded in a Non-Darcy Porous Medium with Suction or Injection

Khaled K. Jaber — 2011-12-10

Journal of Mathematics and Statistics, Published online: 10 December 2011; doi:10.3844/jmssp.2012.15.23

Problem statement: Transient non-Darcy mixed double convection from a semi-infinite, isothermal vertical plate embedded in a homogeneous porous medium, in the presence of surface suction or injection ...

Number of Spanning Trees of Circulant Graphs C_6n and their Applications

S. N. Daoud — 2011-12-12

Journal of Mathematics and Statistics, Published online: 12 December 2011; doi:10.3844/jmssp.2012.24.31

Problem statement: The number of spanning trees of a graph G is usually denoted by τ(G). A circulant graph with n vertices and k jumps is Cn (a1,…..,ak). Approach: In this study the number τ(G) of...

An Embedded Explicit Hybrid Method for Ordinary Differential Equations

F. Samat — 2011-12-23

Journal of Mathematics and Statistics, Published online: 23 December 2011; doi:10.3844/jmssp.2012.32.36

Problem statement: Many differential systems that appear in practice were special second-order ordinary differential equations of the form y" = f (x, y). In the past research, there was a continuous n...

Derivation of the Limits for Control Chart Using the Median Absolute Deviation for Monitoring Non-Normal Process

K. S. Adekeye — 2011-12-24

Journal of Mathematics and Statistics, Published online: 24 December 2011; doi:10.3844/jmssp.2012.37.41

Problem statement: The Shewhart and S control charts, in the literature, were combined to evaluate the stability of a process. These charts were based on the fundamental assumption of normality of the...

A Comparison of the Bayesian and Other Methods for Estimation of Reliability Function for Burr-XII Distribution

Safaa Ali Nasir — 2011-12-27

Journal of Mathematics and Statistics, Published online: 27 December 2011; doi:10.3844/jmssp.2012.42.48

Problem statement: The Burr-XII distribution has been widely used especially in the modeling of life time event data. It provides a statistical model which has a wide variety of application in many ar...

Fitting of Finite Mixture Distributions to Motor Insurance Claims

P. Sattayatham — 2012-01-16

Journal of Mathematics and Statistics, Published online: 16 January 2012; doi:10.3844/jmssp.2012.49.56

Problem statement: The modeling of claims is an important task of actuaries. Our problem is in modelling the actual motor insurance claim data set. In this study, we show that the actual motor insur...

A Study on the Effects of Non-Normality on the Performances of Max-DEWMA Versus SS-DEWMA Charts

Teh Sin Yin — 2012-01-18

Journal of Mathematics and Statistics, Published online: 18 January 2012; doi:10.3844/jmssp.2012.57.63

Problem statement: The called the Sum of Squares Double Exponentially Weighted Moving Average (SS-DEWMA) chart which is effective in detecting shifts in the mean and/or variance is compared with the M...

Modeling of Engineering Student Satisfaction

Zainol Mustafa — 2012-01-18

Journal of Mathematics and Statistics, Published online: 18 January 2012; doi:10.3844/jmssp.2012.64.71

Problem statement: The purpose of this study is first; to identify the antecedents to student satisfaction and the relationship between student satisfaction and promotion. Second; to develop a suitabl...

Fractional Calculus Theoretical Evolution for Radiation Quantities

Amin Al-Okour — 2012-02-02

Journal of Mathematics and Statistics, Published online: 2 February 2012; doi:10.3844/jmssp.2012.72.76

Problem statement: Radiation dosimetry features depend on semi-empirical formulas that lack a strong mathematical framework. This is due to the fact that the microscopic radiation interaction with mat...

Numerical Solution of Higher Order Ordinary Differential Equations by Direct Block Code

N. Waeleh — 2012-02-03

Journal of Mathematics and Statistics, Published online: 3 February 2012; doi:10.3844/jmssp.2012.77.81

Problem statement: This study is concerned with the development of a code based on 2-point block method for solving higher order Initial Value Problems (IVPs) of Ordinary Differential Equations (ODEs)...

A Kind of Intersection Graphs on Ideals of a Ring

A. A. Talebi — 2012-02-06

Journal of Mathematics and Statistics, Published online: 6 February 2012; doi:10.3844/jmssp.2012.82.84

Problem statement: Let R be a ring. The graph G(R) is the graph whose vertices are nontrivial ideal of R and in which two vertices u, v are joined by an edge, if and only if u ∩ v #{0}. Approach: In...

Bayesian Changepoint Analysis of the Extreme Rainfall Events

Wan Zawiah Wan Zin — 2012-02-06

Journal of Mathematics and Statistics, Published online: 6 February 2012; doi:10.3844/jmssp.2012.85.91

Problem statement: This study assesses recent changes in extremes of annual rainfall in Peninsular Malaysia based on daily rainfall data for 50 rain-gauged stations over the period 1975-2004. Approach...

Multiparameterized Soft Set

Abdul Razak Salleh — 2012-02-07

Journal of Mathematics and Statistics, Published online: 7 February 2012; doi:10.3844/jmssp.2012.92.97

Problem statement: In 1999 Molodtsov introduced the concept of a soft set as a general mathematical tool for dealing with uncertainty. The solutions of such problems involve the use of mathematical pr...

A Study on the Behavior of Volatility in Saudi Arabia Stock Market Using Symmetric and Asymmetric GARCH Models

Ajab Al Freedi — 2012-02-07

Journal of Mathematics and Statistics, Published online: 7 February 2012; doi:10.3844/jmssp.2012.98.106

Problem statement: This study examines several stylized facts (heavy-tailedness, leverage effect and persistence) in volatility of stock price returns exploiting symmetric and asymmetric GARCH family ...

Curve Fitting Using Conic by Evolutionary Computing

Zainor Ridzuan Yahya — 2012-02-07

Journal of Mathematics and Statistics, Published online: 7 February 2012; doi:10.3844/jmssp.2012.107.110

Problem statement: A direct method, such as least squares technique is usually used to solve problems involving matching a curve or a surface to a set of data points. The solution obtained by this dir...

On the Derived Subgroups of Some Finite Groups

S. Rashid — 2012-02-08

Journal of Mathematics and Statistics, Published online: 8 February 2012; doi:10.3844/jmssp.2012.111.113

Problem statement: In this study we focus on the derived subgroup of nonabelian 3-generator groups of order p3q, where p and q are distinct primes and p < q. Our main objective is to compute the deriv...

Confidence Interval for Cpm Based on Dp,q Distance

Bahram Sadeghpour Gildeh — 2012-02-08

Journal of Mathematics and Statistics, Published online: 8 February 2012; doi:10.3844/jmssp.2012.114.121

Problem statement: A measurement control system ensures that measuring equipment and measurement processes are fit for their intended use and its importance in achieving product quality objectives. Ap...

Free Convection over a Permeable Horizontal Flat Plate Embedded in a Porous Medium with Radiation Effects and Mixed Thermal Boundary Conditions

Mohd Zuki Salleh — 2012-02-08

Journal of Mathematics and Statistics, Published online: 8 February 2012; doi:10.3844/jmssp.2012.122.128

Problem statement: In this study, the mathematical modeling of free convection boundary layer flow over a permeable horizontal flat plate embedded in a porous medium under mixed thermal boundary condi...

Numerical Solution for 2D European Option Pricing Using Quarter-Sweep Modified Gauss-Seidel Method

Koh Wei Sin — 2012-02-08

Journal of Mathematics and Statistics, Published online: 8 February 2012; doi:10.3844/jmssp.2012.129.135

Problem statement: This study presents the numerical solution of two-dimensional European option pricing problem based on Quarter-Sweep Modified Gauss-Seidel (QSMGS) iterative method. In fact, the pri...

On Prediction of Depreciation Time of Fossil Fuel in Malaysia

Nora Muda — 2012-02-10

Journal of Mathematics and Statistics, Published online: 10 February 2012; doi:10.3844/jmssp.2012.136.143

Problem statement: The fossil fuels play a crucial role in the world energy markets. Demand for fossil fuels become increasingly high and worrisome, because of fossil fuels will be significantly reduc...

Application of Cubic Spline in the Implementation of Braces for the Case of a Child

Rokiah Rozita Ahmad — 2012-02-10

Journal of Mathematics and Statistics, Published online: 10 February 2012; doi:10.3844/jmssp.2012.144.149

Problem statement: Orthodontic teeth movement is influenced by the characteristics of the applied force, including its magnitude and direction which normally based on the shape of ellipsoid, parabolic...

Weyl’s Theorem for Algebraically Class A(s, t) Operators

D. Senthilkumar — 2012-02-13

Journal of Mathematics and Statistics, Published online: 13 February 2012; doi:10.3844/jmssp.2012.150.153

In this study, we show that Weyl’s theorem holds for algebraically class A (s, t) operator acting on Hilbert space. We prove: (i) Weyl’s theorem holds for f (T) for every f belongs to holomorphic ...

Artificial Shortages and Strategic Pricing

Mouataz Zreika — 2012-02-16

Journal of Mathematics and Statistics, Published online: 16 February 2012; doi:10.3844/jmssp.2012.154.156

Problem statement: We consider a monopolist who manipulates the market by artificially creating shortages that result in an increase in current price that, in turn, boosts demand for the product in su...

Policy Decisions for a Price Dependent Demand Rate Inventory Model with Progressive Payments Scheme

Mukesh Kumar — 2012-02-17

Journal of Mathematics and Statistics, Published online: 17 February 2012; doi:10.3844/jmssp.2012.157.164

Problem statement: In this proposed research, we developed an inventory model to formulate an optimal ordering policies for supplier who offers progressive permissible delay periods to the retailer to...

On Applications of Differential Subordination and Differential Operator

M. Darus — 2012-03-01

Journal of Mathematics and Statistics, Published online: 1 March 2012; doi:10.3844/jmssp.2012.165.168

Problem statement: The object of this study is to obtain certain differential subordinations. Approach: Here we use known generalized differential operator given by Darus and Ibrahim and well known le...