The Journal of Middle East and North Africa Sciences

Number 02, 2020

1-10
Forecasting Value-at-Risk of Asian Stock Markets Using the RDCC-GARCH Model Under Different Distributional Assumptions

Authors: Saima Farid; Farhat Iqbal

Abstract

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Number of views: 223

The aim of this paper was to accurately and efficiently forecast from multivariate generalized autoregressive conditional heteroscedastic models. The Rotated Dynamic Conditional Correlation (RDCC) model with the Normal, Student’s-t and Multivariate Exponential Power distributions for errors were used to account for heavy tails commonly observed in financial time series data. The daily stock price data of Karachi, Bombay, Kuala Lumpur and Singapore stock exchanges from January 2008 to December 2017 were used. The predictive capability of RDCC models, with various error distributions, in forecasting one-day-ahead Value-at-Risk (VaR) was assessed by several back-testing procedures. The empirical results of the study revealed that the RDCC model with Student’s-t distribution produced more accurate and reliable risk forecasts than other competing models.

11-17
Management Proposal and Strategic Improvement Applied to A Micro-Hydraulic Services Microenterprise

Authors: Rodolfo Adrián Grajeda Campos; Rosa Cortés Aguirre; Jorge Luis Castañeda Gutiérrez

Abstract

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Number of views: 277

At present due to the progress and development of globalization, the role of microenterprises becomes an increasingly important issue, despite facing an increasingly competitive market-derived from being able to meet the demands of their customers to meet their needs and thereby achieve their loyalty and permanence within them. However, since its classification and with the beginning of the neo-liberal monetarist economic policy model, this type of company represents around 90% of existing companies globally, employing 50% of the workforce and participating in the creation of 50% of world GDP. In Mexico, microenterprises generate about 78% of total existing jobs, which places them as a fundamental part of the economic development of this country.

18-20
Early Diagnosis of Osteopetrosis Type 3 with Neonatal onset with Life-Threatening Complications: A case Report with Review of the Literature

Authors: Nawaf Rahi Al-Shammari; Mohamad Hani Temsah; Walaa Al Shuaibi

Abstract

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Number of views: 208

Osteopetrosis Type 3 with Renal Tubular Acidosis (OPTB3) is a rare inherited autosomal recessive disorder. It is manifested clinically with osteopetrosis, renal tubular acidosis (RTA), cerebral calcification, and growth retardation. Neonatal onset with life-threatening complications warrants a thorough clinical evaluation with an assessment of specialized tests such as x-ray. Here, we discuss a rare case of carbonic anhydrase II deficiency syndrome, presenting with poor feeding and thrombocytopenia, in which the diagnosis was initially missed in the first hospitalization. Upon second admission, re-exanimation of the CXR was suggestive of marble bone disease. Further tests confirmed OPTB3. Following conservative management and family counseling, the patient was discharged in a good general condition. In conclusion, this highlight the need of early identification of the disease, as early appropriate treatment is necessary to improve the patient outcome and prevent complications.

21-29
Comparative Assessment of Emotional Association with Color Preference and Anxiety Levels in Children - A Cross-Sectional Study

Authors: N. S. Venkatesh Babu; C. N. Niranjana; Sahana Mahesh

Abstract

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Number of views: 229

Background. Most of the children are difficult to manage in a dental clinic as they do not cooperate during a dental procedure which may be due to emotional distress experienced by the child during the treatment. By knowing a child's color preference at a point of time, a dentist can evaluate the emotional state and identify fear hence, this study was conducted to assess and compare emotional association with color preference and anxiety levels in children. Aim of The Study. To assess and compare emotional association with color preferences and anxiety levels in children. Methodology. 600 children aged between 6-12 years, were randomly selected from the patients visiting the department of pediatrics and preventive dentistry in V.S dental college. A specially designed proforma was used to record the personal information consisting of, Humphris modified dental anxiety scale and face drawings sheet representing both emotions: Happiness and sadness. The children were provided with 8 crayons and were asked to color the emoticons with their preferred color of choice. Data collected was analyzed statistically by applying a chi-square test. Results. 70.3% (190) children of the younger age group were graded as anxious, while 29% (80) children were found to be non-anxious. 41.2% (136) of the older age group were anxious, while 58.8% of children (194) were non-anxious. 45.9% (126) boys and 41.7% (136) girls preferred yellow to shade the positive emoticon. Black was the preferred color of choice for negative emotion by 41.2% girls (134) and girls (112). Conclusion. From this study, we conclude that adding colors like yellow and pink to the dental environment could enhance a positive attitude and make the child at ease, while black, blue, red and green might impart a negative outlook in their mind.