ISSN: 1818-1074

Issue 49,

Issue 49


The Estimation risk and its impact in building the optimal portfolio of stock market model framework -Analytical study in the Iraq Stock Exchange

THE IRAQI MAGAZINE FOR ADMINISTRATIVE SCIENCES, Volume 12, Issue 49, Pages 65-122

Abstract
This study aimed to build shares portfolios under the traditional approach , which can not take considered Estimation risk and The Bayes approach which takes into consideration Estimation risk And within two cases allow and not allow short-selling and stand out on fundamental differences In construction mechanism and the amount and type of the securities that go into the portfolio, which are excluded from the portfolio. As well as Discuss the impact Estimation risk in building the optimal portfolio of shares in terms of the number of securities that enter the portfolio and in terms trade-off between return and risk namely of the terms of the portfolio performance built. The study was based on the dilemma of two new cases centered the first case about the extent of the portfolio optimization built under the Simplistic models Forum Actions Single indicator model is particularly and The feasibility of and simplicity brought by comparison with the base model of Markowitz . The second controversial case is represented the extent of the effect of Estimation risk in the performance of optimal the portfolio based on Assume of default allow and not allowed to sell short compared to the optimal the portfolio Which it be a corresponding, which was built under the simple staging model based to market index model
The study sample consisted of companies listed on the Iraq Stock Exchange, amounting to (42) companies belonging to various economic sectors for a period of 60 months, from October 2010 until October 2015. On the basis of many models and The financial and The statistical methods , The study concluded many of the the conclusions, perhaps the most important that the Estimation risk and a clear impact in building the optimal the portfolio according to Bayes approach when compared with the traditional approach and This reflects the influence additives risk of a optimal portfolio Because of parametric uncertainty and this is achieved according of two cases allow and not allow short-selling . This effect taking the way to the performance of the built portfolio , if it appears that the built portfolio performance of according of the Bayes approach superiority on the wallet peer built performance of according of traditional approach, which does not take into account the Estimation risk , especially in the case not to allow short selling demand is the most important condition for investors dealers in Iraq market Securities
So The study comes out with many recommendations perhaps the most important the need to to give the utmost attention by the participants in the Iraq Stock Exchange In Bayes approach which translates the effect of Estimation risk in the performance of optimal the portfolio built compared with the traditional simplistic approach Which is Simplified approach from the side And accurately On the other in building the optimal the portfolio compared with the Markowitz approach basis on which experience from complicated calculation and implementation

Role of The behaviors of administrative leadership in achieving organizational excellence A field research in a sample of the Iraqi private banks

THE IRAQI MAGAZINE FOR ADMINISTRATIVE SCIENCES, Volume 12, Issue 49, Pages 205-249

Abstract
The research topic tackled the behaviors of administrative leadership and its role in achieving organizational excellence, Given the importance of the private banking sector and its impact on the country's economy has research was conducted in the (12) banks of the Iraqi private banks were randomly selected, And applied the research on a sample of 120 people from the leaders in the surveyed banks (commissioners managers and branch managers, assistants of managers, and heads of departments). Find the questionnaire as a tool to get of data and information has been adopted as well as personal interviews conducted by the researcher with a number of leaders of the surveyed banks. and sought search to achieve a set of goals, most notably :
1- Prepare of philosophical and theoretical framework based on rooting intellectual and make a modest contribution with respect to variables and dimensions of the current research, which are needed to enrich the conceptual and theoretical widely in order to benefit from the philosophical and intellectual data upon which the setting.
2- know extent interesting the surveyed banks concepts of managerial leadership behaviors and strategies of knowledge management and organizational excellence.
The final result of this research is a set of conclusions of the most important are: (banks researched interest of all the variables and dimensions of search, having influence relations of behaviors of administrative leadership in achieving organizational excellence), he research also included a set of recommendations including (The focus on the behaviors of administrative leadership in the surveyed banks due to their moral impact in achieving organizational excellence, The importance of conducting benchmarks between the surveyed banks and international banks in order to know the most important global developments in the field of banking and knowledge of the most influential behaviors in achieving excellence.
).

Comparing Different Algorithms to Estimate two Parameters of Weighted Rayleigh Distribution

THE IRAQI MAGAZINE FOR ADMINISTRATIVE SCIENCES, Volume 12, Issue 49, Pages 339-352

Abstract
This paper deals with transforming a one parameter Rayleigh distribution, to another family called weighted two parameters Rayleigh, where the weighted functions are necessary when sampling done through samples of different size, also we work of estimating its two parameters using methods of maximum likelihood and moment estimators, and percentile estimators, the comparison has been done through simulation, we need to generate the values using a program of incomplete Gamma function.
Keywords: two parameters weighted Rayleigh distribution, maximum likelihood estimators and moment estimators, percentile estimators.