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A Comparative Study of Some Methods of Estimating Robust Variance Covariance Matrix of the Parameters Estimated by (OLS) in Cross-Sectional Data
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Abstract

The Classical Normal Linear Regression Model Based on Several hypotheses, one of them is Heteroscedasticity as it is known that the wing of least squares method (OLS), under the existence of these two problems make the estimators, lose their desirable properties, in addition the statistical inference becomes unaccepted table. According that we put tow alternative,  the first one is  (Generalized Least Square) Which is denoted by (GLS), and the second alternative is to (Robust covariance matrix estimation) the estimated parameters method(OLS), and that the way (GLS) method neat and certified, if the capabilities (Efficient) and the statistical inference Thread on the basis of an acceptable but this method requires knowledge and knowledge of the nature of the problem and the private model of the problem, whether the Heteroscedasticity otherwise, the method (GLS) become inappropriate. The second alternative is a matrix contrast common variation fortified it does not require prior knowledge of the nature of your problem model, it's also an easy way and by this method has met with popular and interest in more than two decades by researchers, that the estimated of Robust covariance matrix the estimated parameters method(OLS), shall be according to data that is handled type, and we have dealt with in this study, cross-sectional data where the problem of Heteroscedasticity in contrast may be contained therein(Heteroscedasticity- Consistent Covariance matrix Estimation) and symbolized by the (HCCME) and includes many ways, and we have dealt with in our study of these methods  

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Publication Date
Sat Dec 24 2022
Journal Name
Journal Of Legal Sciences
The Nature of the Exoneration : Comparative Study
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The obligation in accordance with the provisions of the Iraqi Civil Code to meet the obligation to meet the charge for the acting renewal in loyalty, clearing, union of disclaimer, acquittal, impossibility of implementation and statute of limitations. However, the subject of our study will focus on one of these reasons, which is exoneration, but we will not deal with the provisions of acquittal in general, as we chose the nature of the acquittal as the target of this study because it provoked a doctrinal debate among Islamic doctrines, as this study lacked to examine the nature of the acquittal by comparing Islamic jurisprudence with civil laws.

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Publication Date
Sat Mar 01 2014
Journal Name
Journal Of The College Of Languages (jcl)
The Impact of Holy Qur’an on Pushkin’s Poetry A Comparative Study
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Praise be to Allah , the Lord of Heavens , Who revealed His Scripture in plain Arabic, and prayers and peace be upon the Master of all creatures and the chosen one , Muhammad (PBUH).Pushkin was known as a poet in Russia, the sun of its poetry that set, the father of the Russian literature and the founder of its literary language. When he published his poems, trying to express his inner poetic feelings and creative visions, he presented them with creativity and special touch. The reason behind the selection of Pushkin as the subject of this study is that he was affected by Islam and Arabs. For the purpose of this study, the dissertation has been divided into introduction and three chapters; each chapter includes two topics. In the introdu

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Publication Date
Mon May 11 2020
Journal Name
Baghdad Science Journal
Proposing Robust LAD-Atan Penalty of Regression Model Estimation for High Dimensional Data
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         The issue of penalized regression model has received considerable critical attention to variable selection. It plays an essential role in dealing with high dimensional data. Arctangent denoted by the Atan penalty has been used in both estimation and variable selection as an efficient method recently. However, the Atan penalty is very sensitive to outliers in response to variables or heavy-tailed error distribution. While the least absolute deviation is a good method to get robustness in regression estimation. The specific objective of this research is to propose a robust Atan estimator from combining these two ideas at once. Simulation experiments and real data applications show that the p

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Publication Date
Thu Jun 01 2017
Journal Name
كلية التربية للبنات
The rights of orphans in the Old Testament and Islam, a Comparative Study
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Allah Almighty has aggrandized the position of orphans and elevated their status in the society and has given the graces for those who sponsor the orphan and care for and protecting them, even those who rub their heads. The divine care is manifested in the verses of the Holy Bible and the Holy Quran. Therefore, the whole world cared for the orphan, and called for the rights of the orphans in the conferences and the channels. But all that was little effort that does not meet what the orphan need and some were only ink on paper that were not applied. All that mentioned above is necessary in dealing with the study (the rights of orphans in the Old Testament and Islam, a Comparative Study). The study was divided into a Preface and four inquirie

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Publication Date
Wed Jun 01 2011
Journal Name
Journal Of Economics And Administrative Sciences
Analysis of the composite variance of dissected splitting experiments carried out according to the Latin box design
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In this research we present An idea of setting up same split plots experiments in many locations and many periods by Latin Square Design. This cases represents a modest contribution in area of design and analysis of experiments. we had written (theoretically)  the general plans, the mathematical models for these experiments, and finding the derivations of EMS for each component (source) of sources of variation of the analysis of variance tables which uses for the statistical analysis for these expirements

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Publication Date
Mon Dec 25 2023
Journal Name
Journal Of Legal Sciences
The legal framework for the process of monitoring the electoral register a In the comparative countries and Iraq : A Comparative Study
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This study entitled (The legal framework for the process of monitoring the electoral register (a comparative study between Egypt and Iraq)) shows the importance of monitoring the right to participate in political life and public affairs، as all electoral legislation in democratic countries is keen on the integrity، integrity and legitimacy of elections، and one of the most important guarantees of this  Existence of effective oversight at every stage of the electoral process، including the preliminary stage. Oversight is the process of collecting and inventorying information about the electoral processes in all its stages، by following an organized mechanism in collecting information on each stage، which is then used to issue o

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Publication Date
Sat Aug 20 2022
Journal Name
Journal Of Legal Sciences
Administrative Collection of State Debt : A comparative study
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           The state's finances consist of a set of rights that have a material value. Since the debtor's failure to pay is conceivable, it is reasonable to assume that the State is in constant need of funds to manage its various activities. The state, but what distinguishes it from others in this case is its ability to fulfill the will of the individual without the need to resort to the judiciary to collect the debt.

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Publication Date
Sat Dec 01 2007
Journal Name
Journal Of Economics And Administrative Sciences
The analysis of time series considers one of the mathematical and statistical methods in explanation of the nature phenomena and its manner in a specific time period.
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The analysis of time series considers one of the mathematical and statistical methods in explanation of the nature phenomena and its manner in a specific time period.

Because the studying of time series can get by building, analysis the models and then forecasting gives the priority for the practicing in different fields, therefore the identification and selection of the model is of great importance in spite of its difficulties.

The selection of a standard methods has the ability for estimation the errors in the estimated the parameters for the model, and there will be a balance between the suitability and the simplicity of the model.

In the analysis of d

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Publication Date
Sat Oct 01 2022
Journal Name
The Egyptian Journal Of Hospital Medicine
Impact of Vitamin D Status on Pregnant Women and Their Neonates: A Cross-Sectional Study
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Publication Date
Wed Apr 10 2019
Journal Name
Journal Of Legal Sciences
The legislative confrontation of the crime of benefiting public money in Iraq -A comparative study-
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The legislator sought to provide the greatest protection for public funds. The wisdom of this is clear and is one of the necessities of running the public utilities regularly and steadily. The waste of public money and its lack of public facilities impede the provision of its services and the delay of services and hindering access to the public. In Iraq, services are lagging behind and almost a collapse in service.

 Hence, the legislator has created a special protection for the employees because of the importance of the role played by this group as they represent the state with all its institutions and to enable them to perform their duties. To make the acts committed against them in the performance of their duties or to cau

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