Z. A. Al-Hemyari

• Ph.D.
• Full Professor at University of Nizwa

In this paper, the numerical method and modelling of a big data set related to global warming are developed using several techniques. The data of daily temperatures is collected from several cities over a 50-year period. To study the existence 8of the global warming precisely, the collected data is to be divided into two equal secondary periods. In...

This study investigates the impact of data augmentation on predictive maintenance machine learning models for robot solar panel cleaning. Data augmentation techniques like synthetic data generation, time-series transformation (shifting, interpolation, and resampling), and extreme condition simulation were used to enhance data diversity and model ge...

This paper focuses on the modeling of the performance of photovoltaic systems based on advanced techniques. This research leverages real-world data from the Shams Solar Facility at the German University of Technology in Oman to explore the application of Linear, Lasso, Ridge, and Elastic Net Regressions to predict and optimize the performance of ph...

One of the powerful statistical techniques is the regression analysis that is used for modelling the relationship of a response variable with one or more explanatory variables. In addition, a variety of ways to estimate agricultural production have been developed in order to help farmers, researchers, and policy makers in several practical problems...

This paper assesses the features/characteristics of a photovoltaic system’s data, investigates the relationship between the soiling and solar panel performance, and leverages real-world data obtained from a solar site in Shams Solar Facility located at the German University of Technology in Oman. Through an experimental approach, different paramete...

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For the purpose of modelling the Reliability of Burr XII Distribution, a family of shrinkage estimators is proposed for any parameter of any distribution when a prior guess value (0) of is available from the past. In addition, two sub-models of the shrinkage type estimators for estimating the reliability and parameters of the Burr XII Distribution...

A response variable's association with one or more explanatory variables examined and modelled using the strong statistical technique, regression analysis. Regression models used in a variety of ways to estimate agricultural production and area, to assist farmers, academics, and policymakers in making well-informed choices. By revealing information...

The purpose of this paper is to develop a Knowledge Management (KM) model in order to investigate and monitor the performance of HEIs in Oman. In this paper, a KM model of five KM components based on the relative performance factor and a critical set of 22 indicators from an original set of 180 indicators are proposed and outlined; in terms of the...

In order for the Higher Education Institutions in the world to work effectively they have collected data, and been developing Multi-dimensional Evaluation method and several indicators through many internal mechanisms for the purpose of improving the performance of institutions, achieving the goal of internal accountability over their activities, i...

This workshop will introduce the participants (academic staff) to the uses and functions of the Statistical Packages for Social Science (statistical software SPSS). It covers data entry and editing, types of random variables, functions of SPSS, and the basics of analyses

The rise in the surface temperature of the Earth since the 19th century is a clear indication of the negative and significant impact humans have had upon it. One of the results of this is many researchers have studied meteorological problems. Some of the important applications for modelling the daily maximum and minimum temperatures, reveal the imp...

In this paper, several “shrunken estimators” for the “ratio of scale parameters of the exponential two-sample problem” using two types of “shrinkage functions” are proposed. The first “shrinkage function” is based on the “maximum likelihood estimator”, and the second is based on the “uniformly minimum variance unbiased estimator”. The “shrunken est...

It is well-known that Statistics is a very old science and was devised because of the need for it in dealing with a variety of issues related to life. It has developed and continues to develop steadily within itself whilst concomitantly developing other sciences which are themselves related to life's issues. Most of the governments in the world are...

International universities conducted surveys aimed at studying the opinions of their stakeholders regarding the institutional management processes, in order to develop their programs and services with the aim of increasing their intake of international students. The aim of this paper is to examine the effectiveness and the quality of institutional...

Continuous quality improvement is an endeavour that higher education institutions (HEIs) undertake to evaluate institutional effectiveness and service quality, and to ensure accountability and transparency to its stakeholders such as academics and students. This study positions academic and student surveys as pragmatic mechanisms that HEIs can rely...

BACKGROUND HEIs implement different techniques for the problem of assessing the progress towards the notified goals or the achievements, which is the only way to ensure that the HEIs are functioning properly along the right way or not. OBJECTIVE The aim of this paper is to propose a model for assessing the performance, which may be of interest to...

This study proposes a two-stage shrinkage Bayesian estimation of the shape parameter of Pareto distribution. Additional information from the past and considered presently in new estimation processes has been receiving considerable attention in the last few decades, especially when a sample unit is costly or difficult to obtain. The proposed two-sta...

The use of statistics has permeated almost every facet of our lives. The daily newspapers and the televised news reports supply us with numerous summaries of statistical data such as stock market reports, financial summaries, inflation, diseases, universities, populations, and weather problems. Governments, organizations, companies, business, and i...

The UoN celebrated the World Statistics Day.

The quality and performance of higher education institutions (HEIs) are crucial to the success of HEIs in the short and long run. In this paper, a knowledge management (KM) model for HEIs is developed and proposed as an appraising mechanism that can be used to identify and monitor the quality and performance areas that are important to HEIs. The co...

This paper considers a class of an efficient 'two-stage shrinkage testimator' (TSST) of 'reliability function' of 'exponential distribution', and the class uses additional information which can be obtained from the past practices, and in the form of past initial estimates (λ 0) about the unknown parameter λ. The TSST is dependent upon a convenient...

This article considers a class of an efficient "two-stage shrinkage testimator" of "reliability function" of "exponential distribution", and the class uses and utilizes additional information which can be obtained from the past practices, and in the form of past initial estimates (o ) about the unknown parameter . The TSST is dependent upon a con...

Utilising the prior information or additional information from the past in new estimation processes has been receiving considerable attention in the last few decades - as such appears from the list of the references of this paper. In fact, the shrinkage testimators were developed originally for the purpose of utilising the prior information in new...

An elementary book of Statistics for all undergraduate students. It covers the following topics: Common areas of use. Types job opportunities. Sources of data : Internal data and external data .Types of data: Nominal, ordinal, interval and ratio. Statistical data terminology : Population, population characteristics, sample ,population census , samp...

The aims of this presentation are [to] : Explain the results of the projects; Discuss the benefits of the projects in the process of Academic Accreditation and Discuss the standards and examples.

It is well known that the concept of quality in higher education is a compound concept which depends on many dimensions and factors. Moreover, there exist many common quality approaches which are used to assess the quality and performance of HEIs. In the last decade, the performance and quality measurement approaches of institutional activities hav...

The paper explains the definition, meaning and importance of Statistics

1 First of all, I would like to thank you for reply and remarks given in the draft table of the RPIs (Ranking Performance Indicators) proposal and for proposing additional indicators. After a detailed reading of the remarks, I would like to mention the following points: 1. The ranking indicators are proposed on the basis of the instruction "prepari...

The project is based on five streams and twenty four objectives and 116 indicators. It may be worthwhile to mention that clarity, importance and approbation of objectives and some other characteristics were studied in several papers by Al-Hemyari, Z. A. and Al-Sarmi, M. (2014, 2015). Moreover, the weights of all objectives were proposed in this pro...

In this manual the proposed indicators of the project of ranking were studied and defined. The mechanisms of calculation the indicators were studied and proposed. Practical examples were given and illustrated.

In this report, the purposes of the indicators have been explained, the mechanisms of calculation the indicators and purposes of ranking indicators have also discussed and explained.

An elementary book of Statistics for all undergraduate students. It covers the following topics: Common areas of use. Types job opportunities. Sources of data : Internal data and external data .Types of data: Nominal, ordinal, interval and ratio. Statistical data terminology : Population, population characteristics, sample ,population census , samp...

This book is an introduction to probability theory and distribution for B.Sc. students in Mathematics and Statistics. Contains the following chapters: Introduction & Some Concepts; Combinatorics; Compounding Events; Conditional Probability; Random Variables; Cumulative Distribution Functions & Moments; Some Discrete Distributions and Some Continuou...

This presentation is presented in Department of Department of Mathematics, University of Indonesia, Indonesia (Fab., 28, 2018). In this presentation, the following topics were presented and discussed: What are the shrinkage methods? 1. What are the Single Stage Shrunken Estimators? 2. What are the Preliminary Test Single Stage Shrunken Estimators?...

The presentation shows the performance of ACSs. National and international compression were given

In the last decade, international organisations (World Bank, OECD and OEU) and many European countries have been apprised of the urgent need to develop and enhance what is generally termed “intellectual capital” and thus the “knowledge creating organization”. The importance of this is something that is increasingly being realised. The importance of...

Utilizing the prior information or additional information from the past in new estimation processes has been receiving considerable attention in the last few decades - as such appears from the list of the references of this paper. It may be worth mentioning that the shrinkage testimators were developed orginally for the purpose of utilizing the pri...

Investigating and utilizing the feedback, academic staff opinions and students’ perceptions on teaching and learning will impact the quality of teaching and play an important role in expanding the reputation of institutions. The qualitative and quantitative investigations of feedback, academic staff opinions and students’ perceptions in assessing t...

This research is applied in private HEIs to study and evaluate the level of satisfaction, and to estimate the level of participation and engagement of students and academic staff. Two surveys for students and academic staff were used and administrated in 40 HEIs. The sample was drawn from the target population and divided into sub-stratified random...

The notion of assessing the quality and performance of institutions to assess the level of achievements of the institutional goals have been negotiated between institutions, researchers and societies for a long time ago and has become an international and vital issue, and consists of identifying the best technique to fulfill this purpose. Much has...

One of the major and ongoing goals in higher education institutions, is to satisfy students and to meet students' needs. In fact, student satisfaction is a logically compound concept and multi-level issue and in order to study the level of student satisfaction in institutions and students' perceptions and expectations in a quality of teaching conte...

Al-Farahidi Performative Framework, Tools and Mechanisms to assess the Performance of Institutions Summary: It is well known that the world has been affected by many economic and social problems on a large scale. Such challenges have affected the societies in developing countries significantly, and at the same time, they have affected the higher ed...

It is well known that Statistics is a very old discipline which is based upon improving and reinforcing “human thinking”. In fact, Statistics has permeated almost every facet of our lives and subconsciously we use statistics/probability in every footstep we take in our day to day existence. In addition, statistical techniques have become critical f...

During my thirty years of statistics, mathematics, reliability and operation research sciences teaching career, I taught most of B.Sc. courses in statistics, a few B.Sc. courses in mathematics and several courses for postgraduate studies (in statistics and mathematics), as it is shown in my attached C.V., to students with a broad range of needs and...

It is well known that higher education institutions nowadays are affected by many serious structural factors which create a very intense competitive situation among these HEIs. In addition, the existence of institutions strongly depends on attracting students and in the retention of students. The reputation of institutions, the quality of instituti...

1. Discuss the concepts of satisfaction and engagements; 2. Propose the surveys of satisfaction, participation and engagement of students and academic staff; 3. Study the validity of the surveys and 4. Study the reliability of the surveys.

Abstract: This paper examines an estimation of the scale parameter of the Weibull two parameters where we believe that there is prior information about the scale parameter. We propose, for this situation, two Bayes-shrinkage and three preliminary test Bayes-shrinkage estimators. The expressions for the bias, mean squared error and relative efficien...

It is well known that the concept of quality in higher education is a compound concept which depends on many dimensions and factors. Moreover, there exist many common quality approaches which are used to assess the quality and performance of HEIs. In the last decade, the performance and quality measurement approaches of institutional activities hav...

It is well known that the concept of quality in higher education is a compound concept which depends on many dimensions and factors. Moreover, there exist many common quality approaches which are used to assess the quality and performance of HEIs. In the last decade, the performance and quality measurement approaches of institutional activities hav...

The problem of setting standards and benchmarking the quality of educational activities of HEIs in Oman is described. In order to do so, twenty one qualitative performance indicators activities were selected, defined, computed and considered as standards for HEIs in Oman. Two surveys were designed to collect the data from private HEIs for the activ...

Quality of HEIs has become a very important issue in the world. Quality in the developing countries has been influenced by many factors such as extended demand of students to higher education, weakness of preparing student to labor market, shortage of educational services, shortage of resources and limited public funding. This in turn has imparted...

The theme of assessing the quality of HEIs has received a considerable attention from different international organizations such as the UNESCO, World Bank, OECD, EUA, HEFCE, and CHE-SASSE as well as from world leading HEIs. The quality of “input”, “output” and “processes” of HEIs are widely examined by the use of statistical indicators (SIs) techni...

Abstract: In the process of education, a number of elements including learners, skills and teaching methods form a trinity that inevitably plays interrelated roles affecting the performance, achievements, and quality of future workforce. This paper explores essential metacognition thinking skills of higher education students. In addition, it invest...

In this article, we have proposed two efficient and modified preliminary test shrunken estimators for the response of the simple linear regression model Y, and the regression parameter β when prior guess values of μY and β are available. The expressions for the bias, mean squared error, and relative efficiency of the proposed testimators are derive...

Abstract The theme of assessing the quality of HEIs has received a considerable attention from different international organizations such as the UNESCO, World Bank, OECD, EUA, HEFCE, and CHE-SASSE as well as from world leading HEIs. The quality of “input”, “output” and “processes” of HEIs are widely examined by the use of statistical indicators (S...

In this article, we have proposed two efficient and modified preliminary test shrunken estimators for the response of the simple linear regression model Y, and the regression parameter when prior guess values of and are available. The expressions for the bias, mean squared error, and relative efficiency of the proposed testimators are derived and s...

Abstract. One of the most important problems in the estimation of the parameter of the failure model, is the cost of experimental sampling units, which can be reduced by using any prior information available about q , and devising a two-stage pooling shrunken estimation procedure. We have proposed an estimator of the reliability function ( R(t) ) o...

The problem of setting standards and benchmarking the quality of educational activities of HEIs in Oman is described. In order to do so, twenty one qualitative performance indicators (activities) were selected, defined, computed and considered as standards for HEIs in Oman. Two surveys were designed to collect the data from private HEIs for the act...

In this article, we have assumed that the observations are carried out for a period of time T, and when a unit failed, it was replaced with a new identical unit. We have considered the exponential distribution of failure, and we have proposed two estimators of reliability function () by using time-censored data when a prior value (uncertain prior i...

The theme of assessing the quality of higher education institutions (HEIs) has received a considerable attention from different world international organizations (like the UNESCO, World Bank, OECD, EUA, HEFCE, and CHE-SASSE) and from world leading HEIs. The quality of input, output and processes of HEIs are widely examined by the use of performance...

In order to appraise the quality of any HEI and its performance, the broad goals of HEI should be clearly defined, constructed and refined to present brief, measurable and clear objectives. Then, a set of PIs should be selected and aligned with refined objectives (AlSarmi and Al-Hemyari, 2013;2014).

Research has been conducted on goals, objectives and measures to assess the processes and activities of private or government higher education institutions (HEIs) in a number of countries and international bodies. This study is intended to refine the goals and objectives of HEIs for assessing the performance of higher education institutions in Oman...

Quantitative and qualitative statistical indicators play a vital role in assessing the activities of higher education institutions and improving and strengthening the educational system. The research on applying statistical indicators to higher education has been done in many countries and international organisations (like UNESCO, World Bank, OECD...

Abstract: This paper has examined the characteristics and quality properties of statistical indicators which were used to assess the activities and the performance of higher education institutions (HEIs). In order to do so, 150 statistical indicators have been reviewed and a questionnaire has been modified and distributed to measure the characteris...

Abstract: Research has been conducted on goals, objectives and measures to assess the processes and activities of private or government higher education institutions (HEIs) in a number of countries and international bodies. This study is intended to refine the goals and objectives of HEIs for assessing the performance of higher education institutio...

Abstract Quantitative and qualitative statistical indicators play a vital role in assessing the activities of higher education institutions and improving and strengthening the educational system. The research on applying statistical indicators to higher education has been done in many countries and international organizations (like UNESCO, World B...

Abstract: In the process of education, a number of elements including learners, skills and teaching methods form a trinity that inevitably plays interrelated roles affecting the performance, achievements, and quality of future workforce. This paper explores essential metacognition thinking skills of higher education students. In addition, it invest...

Exponential distribution plays a key role in engineering reliability and its applications. The exponential failure model has been studied for years. This article introduces two new preliminary test estimators for the reliability function ( ) in complete and censored samples from the exponential model with the use of a prior estimation of the mean ....

Abstract: This paper examines the ranking and performing indicators and procedures of higher education institutions. It also presents a summary of those international institutions which employ them as well as the aims of this ranking, the execution mechanisms, rules of data collection and some international problems and difficulties associated with...

This paper suggests an estimation technique for the scale parameter ( ) and the reliability function ( ) in right censored data from the two- parameter Weibull model. Four different versions of the preliminary test shrinkage estimator are considered when a prior estimate of the scale parameter is given. Numerical computations for the bias and the r...

his paper suggests preliminary test shrinkage estimation techniques for the scale parameter () and reliability function ()(tR) in right censored data from the two-parameter Weibull model. Two preliminary test shrinkage estimators are considered when a prior estimate of the scale parameter is available from the past experiences. The expressions of...

Quantitative and qualitative statistical indicators play a vital role in assessing the activities of higher education institutions and improving and strengthening the educational system. The research on applying statistical indicators to higher education has been done in many countries and international organizations (like UNESCO, World Bank, OECD...

In this article, we have proposed two efficient and modified preliminary test shrunken estimators for the response of the simple linear regression model Y, and the regression parameter when prior guess values of and are available. The expressions for the bias, mean squared error and relative efficiency of the proposed testimators are derived and st...

Quality and performance play a central function in any Higher Education Institution (HEI). They are affected by many variables and it can be expressed as a function of multi-dimensional factors. The literature identifies many important reasons for monitoring the performance of HEIs and a range of quality and performance approaches to measurement wh...

This paper suggests an estimation technique for the scale parameter (β) and the reliability function (R(t)) in right censored data from the two-parameter Weibull model. Four different versions of the preliminary test shrinkage estimator are considered when a prior estimate of the scale parameter is given. Numerical computations for the bias and the...

The research was planned to serve the following objectives: to select and apply some important PIs in private HEIs. to study and compare the performance of private HEIs through the PIs.

In this paper, it is shown that a complex multivariate random variable is a complex multivariate normal random variable of dimensionality if and only if all nondegenerate complex linear combinations of have a complex univariate normal distribution. The characteristic function of has been derived, and simpler forms of some theorems have been given u...

In this paper, we propose two classes of shrinkage estimators for the shape parameter of the Weibull distribution in censored samples. The proposed estimators are studied theoretically and have been compared numerically with existing estimators. Computer intensive calculations for bias and relative efficiency show that for, different values of leve...

In this paper, we propose two classes of shrinkage estimators for the shape parameter of the Weibull distribution in censored samples. The proposed estimators are studied theoretically and have been compared numerically with existing estimators. Computer intensive calculations for bias and relative efficiency show that for, different values of leve...

The estimation of reliability function has attracted worldwide attention during the past several decades. The estimation procedure usually begins with parameter estimation based on test data. When there is no prior information in tests, traditional approaches like Maximum Likelihood Estimation (MLE) can be applied to estimate parameters. When, ther...

One of the most important problems in the estimation of the parameter of the failure model, is the cost of experimental sampling units, which can be reduced by using any prior information available about q , and devising a two-stage pooling shrunken estimation procedure. We have proposed an estimator of the reliability function ( R(t) ) of the expo...

Research has been conducted on goals, objectives and measures to assess the processes and activities of private or government higher education institutions (HEIs) in a number of countries and international bodies. This study is intended to refine the goals and objectives of HEIs for assessing the performance of higher education institutions in Oman...

The performance of an estimator can be improved by incorporating some additional information available, besides the sample information. Our interest is to estimate the mean, slope, and response of simple linear regression model when some prior guess values are available from the past. The relative performances of the proposed estimators are investi...