Tarek Omara | Kafrelsheikh University (original) (raw)

Papers by Tarek Omara

Interdisciplinaria, 2023

Happiness and achieving quality of life primarily depends on the nature of the place in which... more Happiness and achieving quality of life
primarily depends on the nature of the place
in which we live. The religious/spiritual factor
is considered a basic factor for understanding
the quality of life of individuals. The study at
hand used the Arabic version of WHOQoLSRPB to analyze the religious and spiritual
factor affecting the quality of life in Islamic
holy cities. The scale was applied to 671 residents of Medina with an average age of 51.6
years, of which 527 (78.5 %) are males and
144 (21.5 %) are females, and they are all
Muslims. The results showed that all factors
have good internal consistency, since the
Alpha Cronbach value was .81 at a significant level of p < .001, and its value for the
factors ranged between .75-.89, which are
high values and significant at p < .001 except
for the “Wholeness” factor, which was significant at p < .01. Moreover, the results of the
intra-class correlations coefficients (ICC) test
showed that all WHOQoL-SRPB factors are
acceptable, as their values ranged between
(.82-.93), and all of them were significant at
p < .001.
A confirmatory factor analysis was
performed to extract the factors that affect
quality of life, in addition to testing the
psychometric properties of this scale. The
Eight-First-Order-Factors model, which has
been modified to Five-Second-Order -Factors
model, was used, and it showed that it achieved
the quality of fit as it was χ2/df = 4.275, which
is significant at p < .001. Likewise, the values
of GFI = .959, RMSEA = .052, CFI = .96,
RMR = .01, and the results showed that there
are five significant factors that describe the
quality of life in Medina. Namely: Spiritual
connection - Meaning in life - Inner peace -
Hope and optimism - Faith.
Keywords: Quality of Life - WHOQoL-SRPB
Index - Religious / Spiritual Factor - Confirmatory Factor Analysis - Cities of an Islamic
Character.

Heliyon, 2022

This paper introduces an almost unbiased modified ridge-type estimator (AUMRTE) to avoid problems... more This paper introduces an almost unbiased modified ridge-type estimator (AUMRTE) to avoid problems arising from multicollinearity. This estimator has the important features of the two important shrinkage estimators, the modified ridge-type estimator (MRTE) and almost unbiased estimator (AUE). We investigated the theoretical excellence of the proposed estimator according to the mean square error (MSE). We found that it has the superiority than the (MRTE) and almost unbiased two-parameter estimator (AUTE). Moreover, we run the simulation study, which depended on the simulated MSE (SMSE), squared bias (SB) and generalized crossvalidation (GCV) as criteria to compare the estimators. The simulation results showed that the proposed estimator has the superiority than the estimators under comparison at several factors and at the same time, it works well at the high level of correlation. In addition, we investigated the behavior of the present estimator applying the real data. Under this trend, we applied the estimator to the tourism sector data in Egypt, which the results were consistent with the theoretical results.

Statistics, optimization and information computing, 2021

The Liu-type estimator is one of the shrink estimators that is used to remedy for a problem of mu... more The Liu-type estimator is one of the shrink estimators that is used to remedy for a problem of multicollinearity in SUR model, but it is sensitive to the outlier. In this paper, we introduce the S Liu-type (SLiu-type) and MM Liu-type estimator (MMLiu-type) for SUR model. These estimators merge Liu-type estimator with S-estimator and with MMestimator which makes it have high robustness at the different level of efficiency and at the same time prevents the bad effects of multicollinearity. Moreover, to get more robust features, we have modified the Liu-type estimator by making it depend on MM estimator instead of GLS estimator. The asymptotical properties for the suggested estimator were discussed and we used the fast and robust bootstrap (FRB) to obtain the suggested robust estimators. Furthermore, we run the simulation study to show the extent of excellence for the suggested robust estimators relative to the other estimators by many factors.

University Library of Munich, Germany, 2013

Focusing on a threshold regression analysis, the result provides new evidence that the negative e... more Focusing on a threshold regression analysis, the result provides new evidence that the negative effect of exchange rate depreciation on exports takes place as certain threshold level of credit market imperfection has been attained.

In this paper, the weight least absolute deviation adaptive lasso optimal scaling method (WLAD-CA... more In this paper, the weight least absolute deviation adaptive lasso optimal scaling method (WLAD-CATREG adaptive lasso) and weight least absolute deviation adaptive elastic net regression with optimal scaling method (WLAD-CATREG adoptive elastic net) will introduced, which is combined of weight least absolute deviation regression (WLAD-CATREG) and adaptive lasso (A-Lasso) or adaptive elastic net regression (A-Elastic net) with optimal scaling. Thus (WLAD-CATREG adoptive elastic net) method aim to automatically select variable, aspire to gropes effect and erase the bad effect of leverage points and outliers simultaneously, these aims cannot be achieved by (WLAD-CATREG), adaptive lasso regression (A-Lasso), weight robust adaptive lasso regression (WLAD-CATREG adoptive lasso), Weight least absolute deviation elastic net regression (WLAD-CATREG elastic net). Simulation study will be running to validated superiority of the (WLAD-CATREG adoptive Lasso) and (WLAD-CATREG adoptive elastic net).

Pakistan Journal of Statistics and Operation Research

In this paper, we introduce new Stochastic Restricted Estimator for SUR model, defined by Stochas... more In this paper, we introduce new Stochastic Restricted Estimator for SUR model, defined by StochasticÂ Restricted Liu TypeÂ SUR estimator (SRLTSE) . The propose estimator has deal with multicollinearity in SUR model if there is a degree of uncertainty in the parameters restriction. Moreover, the superiority of (SRLTSE) estimatorÂ was derived with respect to mean squared error matrix (MSEM) criteria. Finally, a simulation study was conducted. This simulation used standard mean squares errorÂ (MSE) criterion to illustrate the advantage between StochasticÂ Restricted SUR estimator (SRSE), StochasticÂ Restricted Ridge SUR estimator (SRRSE), and StochasticÂ Restricted Liu TypeÂ SUR estimator (SRLTSE) at several factors.Â

Geological Society, …, 2003

PETER T. O'MARA 1, MARILYN MERRYWEATHER 2, MARK STOCKWELL 3 & MIKE M. BOWLER 4 ARCO British ... more PETER T. O'MARA 1, MARILYN MERRYWEATHER 2, MARK STOCKWELL 3 & MIKE M. BOWLER 4 ARCO British Ltd, London Square, Cross Lanes, Guildford, Surrey GU1 1UE, UK 1 Present address." Ruhrgas UK Exploration and Production Ltd, New Zealand House, 8th Floor, 80 ...

If we consider that, the SUR model suffered from outliers, multicollinarity and it involved a deg... more If we consider that, the SUR model suffered from outliers, multicollinarity and it involved a degree of uncertainty associated with restrictions on the parameters. Three estimators introduced

Journal of Oral and Maxillofacial Surgery, 2008

To evaluate the indications and outcomes of airway management by submental intubation or tracheos... more To evaluate the indications and outcomes of airway management by submental intubation or tracheostomy in patients with maxillofacial trauma, and to describe the technique of submental intubation in detail and discuss its latest refinements. Of 356 patients admitted from January 2004 through September 2007 with maxillofacial trauma, 222 were operated on under general anesthesia. Eight patients underwent urgent or elective tracheostomy; 8 patients underwent submental intubation. Seven patients with submental intubation were extubated at the end of the procedure. One patient received elective tracheostomy 3 days later. We did not encounter any complications in the tracheostomy group, while 1 case of slight damage to the endotracheal tube occurred in the submental intubation group. Submental endotracheal intubation is a simple technique with very low morbidity and can replace tracheostomy in selected cases of maxillofacial trauma without indication for prolonged ventilation support.

Tarek Omara

In this paper, we suggest a new biased Liu-Type estimator for the vector of parameters in a two S... more In this paper, we suggest a new biased Liu-Type estimator for the vector of parameters in a two SUR model. This Liu-type two SUR estimator based on ridge estimation. Furthermore, the superiority of this estimator from the ridge estimator and Liu-Type estimator was verified by mean square error (MSE). Finally, a simulation study was used to compare the proposed estimator with other ridge and Liu estimators for two SUR regression.

Pushpa Publishing House, 2019