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jeasiq-1749
Comparison of some robust methods in the presence of problems of multicollinearity and high leverage points
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Abstract

The multiple linear regression model of the important regression models used in the analysis for different fields of science Such as business, economics, medicine and social sciences high in data has undesirable effects on analysis results . The multicollinearity is a major problem in multiple linear regression. In its simplest state, it leads to the departure of the model parameter that is capable of its scientific properties, Also there is an important problem in regression analysis is the presence of high leverage points in the data have undesirable effects on the results of the analysis , In this research , we present some of the robust methods in the multiple linear regression model These methods include the (Jackknife Ridge regression) methods based on the (MM) estimator and the (GM2) estimator (Modified Generalized M-estimator) . Using the Monte Carlo simulation, the two methods were compared in accordance with the comparison criterion, the mean squares error (MSE) and sample sizes  (n = 20, n = 50, n = 100) and different pollution ratios (τ = 5%, 15%) , The comparison shows that (RJGM2) is the best method for estimating the parameters of the multiple linear regression model, which has the lowest value for mean squares error (MSE) compared with the rest of the other estimations.

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Publication Date
Sun Mar 29 2020
Journal Name
Iraqi Journal Of Chemical And Petroleum Engineering
Using Different Methods to Predict Oil in Place in Mishrif Formation / Amara Oil Field
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The reserve estimation process is continuous during the life of the field due to risk and inaccuracy that are considered an endemic problem thereby must be studied. Furthermore, the truth and properly defined hydrocarbon content can be identified just only at the field depletion. As a result, reserve estimation challenge is a function of time and available data. Reserve estimation can be divided into five types: analogy, volumetric, decline curve analysis, material balance and reservoir simulation, each of them differs from another to the kind of data required. The choice of the suitable and appropriate method relies on reservoir maturity, heterogeneity in the reservoir and data acquisition required. In this research, three types of rese

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Publication Date
Fri Feb 08 2019
Journal Name
Journal Of The College Of Education For Women
التدخل السوري في لبنان وإشكالیة العلاقة السوریة – اللبنانیة
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The relation ship between Syria and Lebanon is a distinguished one
because of the cultural social geographic and historical common factors. So
that, Syria considers that Lebanon has a stratieyical depth for it, especially its
conflict with (Israel) does end and parts of its lands still under the occupation
of the Zionist thus, any conflict in Lebanon between parties and ethnics
groups could be considered an important influence on the bases of the Syrian
policy. Moreover the issue of Palestine which is considered the central issue
for Syria and Arab as whole. In addition to some of the political movements
that happened in the region itself. It could be said that Syrian interference in
Lebanon has a positive infl

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Publication Date
Sun Jan 01 2017
Journal Name
Journal Of Sensors
Sequential Monte Carlo Localization Methods in Mobile Wireless Sensor Networks: A Review
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The advancement of digital technology has increased the deployment of wireless sensor networks (WSNs) in our daily life. However, locating sensor nodes is a challenging task in WSNs. Sensing data without an accurate location is worthless, especially in critical applications. The pioneering technique in range-free localization schemes is a sequential Monte Carlo (SMC) method, which utilizes network connectivity to estimate sensor location without additional hardware. This study presents a comprehensive survey of state-of-the-art SMC localization schemes. We present the schemes as a thematic taxonomy of localization operation in SMC. Moreover, the critical characteristics of each existing scheme are analyzed to identify its advantages

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Publication Date
Wed Jan 01 2020
Journal Name
Journal Of King Saud University - Science
Three iterative methods for solving second order nonlinear ODEs arising in physics
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Publication Date
Sun Sep 04 2016
Journal Name
Baghdad Science Journal
Synthesizing, Characterizing and Studying the Biological Activity of Some New Schiff-Bases Derivatives Containing the Monosaccharide Moiety
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A new series of ?-D-glucose as Schiff bases derivatives is synthesized and characterized with studying their bioactivity. Hydroxyl groups at C (1,2&5,6) sugar moiety are converted into acetal form through a reaction with dry acetone using phosphoric acid and anhydrous zinc chloride as catalysts producing 1,2:5,6-di-O-isopropyledine ?-D-glucofuranose(I). The five memberd ring acetal of C(5,6) is hydrolyzed with acetic acid (65%)and a reaction of the new product with sodium periodate is carried on to get an aldehyde moiety which is used to produce a new series of Schiff bases through reacting with different amino compounds such as 4-amino antipyrene . The suggested chemical structures of the prepared compounds are confirmed by using UV., FT

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Publication Date
Wed Mar 10 2021
Journal Name
Baghdad Science Journal
Some Immunologic Evaluations of Toxoplasmosis in Iraqi Aborted Females
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Forty-eight aborted women (Iraqi Arab Muslims) at the first trimester with a serological evidence of toxoplasmosis were investigated. Two age- and ethnic-matched control groups were included: 40 aborted women due to accidental events (Control I), and 40 unmarried (virgin) women (Control II). The subjects were evaluated for the following parameters: HLA-class I antigens (A, B and Cw), blood groups, total and differential counts of leukocytes, lymphocyte subpopulations (CD3+, CD4+ and CD20+ cells), phagocytosis of heat-killed yeast (phagocytic index and NBT index), and total serum levels of immunoglobulins (IgA, IgG and IgM) and complement components (C3 and C4). The HLA-A2 and -Cw8 antigens were significantly increased in the patien

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Publication Date
Sat Apr 01 2023
Journal Name
Physics Of Atomic Nuclei
Differences in Ground State Properties of Some Mirror Nuclei
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Publication Date
Fri Dec 29 2023
Journal Name
Studia Chemia
THERMODYNAMIC STUDY OF SOME ALCOHOLS IN DILUTE AQUEOUS SOLUTION
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Publication Date
Sun Sep 01 2019
Journal Name
Journal Of Physics: Conference Series
Evaluation of Nuclear safety procedures in some Iraqi universities
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Publication Date
Fri Feb 08 2019
Journal Name
Journal Of The College Of Education For Women
إدراك الأزیاء في ظل علاقاتھا الجمالیة بعناصر العرض المسرحي
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The fashion accused important optical avenge with the rest of visual elements
, That style of fashion design stir up beautiful feelings by using fashion forming
that is suitable with the nature of designable treatments to other elements .
The fashions contains the nature of relation ships of educational address and
the kind of beliefs , So the visual beauty is limited for those relation which are the
designer fashion tried to redesign and set them anew . so as to goes with beautifully
with the last visual for fashions.

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