Open Access Original Research Article

The Zubair-Inverse Lomax Distribution with Applications

Jamilu Yunusa Falgore

Asian Journal of Probability and Statistics, Page 1-14
DOI: 10.9734/ajpas/2020/v8i330206

In this article, an extension of Inverse Lomax (IL) distribution with the Zubair-G family is considered . Various statistical properties of the new model where derived, including moment generating function, R´enyi entropy, and order statistics. A Monte Carlo simulation study was presented to evaluate the performance of the maximum likelihood estimators. The new model can be skew to the right, constant, and decreasing functions depending on the parameter values.
We discussed the estimation of the model parameters by maximum likelihood method. The application of the new model to the data sets indicates that the new model is better than the existing competitors as it has minimum value of statistics criteria.

Open Access Original Research Article

The First and Second Zagreb Index of Complement Graph and Its Applications of Molecular Graph

Mohammed S. Alsharafi, Mahioub M. Shubatah, Abdu Q. Alameri

Asian Journal of Probability and Statistics, Page 15-30
DOI: 10.9734/ajpas/2020/v8i330207

In this paper, some basic mathematical operation for the second Zagreb indices of graph containing the join and strong product of graph operation, and the rst and second Zagreb indices of complement graph operations such as cartesian product G1 G2, composition G1 G2, disjunction G1 _ G2, symmetric dierence G1 G2, join G1 + G2, tensor product G1  G2, and strong product G1 G2 will be explained. The results are applied to molecular graph of nanotorus and titania nanotubes.

Open Access Original Research Article

Comparison of Generalized Linear Model and Generalized Linear Mixed Model – An Application to Low Birth Weight Data

Michael Fosu Ofori, Stephen B. Twum, Jackson A. Y. Osborne

Asian Journal of Probability and Statistics, Page 31-37
DOI: 10.9734/ajpas/2020/v8i330208

Background: Generalized Linear models are mostly fitted to data that are not correlated. However, very often data that are collected from health and epidemiological studies are correlated either as a result of the sampling methods or the randomness associated with the collection of such data. Therefore, fitting generalized linear models to such data that produce only fixed effects could lead to over dispersion in the model estimates.

Objectives: The objective of this study is to fit both generalized linear and generalized linear mixed models to a correlated data and compare the results of the two models.

Methods: Logistic regression is employed in fitting the generalized linear model since the dependent variable in the study is bivariate whilst the GLIMMIX model in SAS is used to fit the generalized linear mixed model.

Results: The generalized linear model produces over dispersion with higher errors among the parameter estimates than the generalized linear mixed model.

Conclusion: In dealing with a more correlated data, generalized linear mixed model, which can handle both fixed and random effects, is preferable to generalized linear model.

Open Access Original Research Article

Reliability Analysis of Flexible Pavement Using First Order Method

Sameh S. Abd El- Fattah, Ahmed E. Abu El- Maaty, Ibrahim H. Hashim

Asian Journal of Probability and Statistics, Page 38-54
DOI: 10.9734/ajpas/2020/v8i330209

Flexible pavement design is influenced by many design parameters such as (traffic characterization, pavement depths, structure materials and environmental conditions). To study the impact of variations in design parameters on pavement performance, several attempts have been achieved to add reliability concept to the mechanistic-empirical (M-E) design of pavements. In (M-E) design of pavements, the pavement life depends on subgrade rutting and fatigue cracking, considering them as independent failure patterns. The current design methodology used in many countries such as Egypt is ignoring the impact of temperature variation (despite its importance) on the pavement design. This research aimed to predict the pavement reliability due to variation in pavement design parameters especially temperature using the first-order reliability method (FORM) considering rutting and fatigue failures. Moreover, a comparison was performed between regressions models represented from different pavement agencies to recommend the most efficient one for Egyptian temperature. The results obtained that, considering design parameters variations (without temperature); the reliability based on US Army Corps method (91.64%) was the nearest one to the current design methodology in Egypt (91.0%). After adding temperature variations, the reliability was clearly affected where the regression model of Shell Research agency was the most appropriate one for all Egyptian temperature zones as it achieved the lowest error mean (-0.03) and the lowest error standard deviation (0.0011). Moreover, the air temperature of 28ºC was considered as the inflection point for pavement reliability-temperature curve in Egypt.

Open Access Original Research Article

Error Analysis of Meshfree Approximation in Nonlinear Black-Scholes Model

Godwin Onwona-Agyeman, Francis T. Oduro, Gabriel Asare Okyere, Awudu Obeng

Asian Journal of Probability and Statistics, Page 55-63
DOI: 10.9734/ajpas/2020/v8i330210

The transaction cost model of Guy Barles and Halil Mete Soner is incorporated into the standard Black Scholes Equation. The resulting model is solved by a numerical method, called, the meshfree approximation using radial basis function. The errors produced by the scheme are discussed and presented in diagrams and tables.