With Jumps: An Introduction to Power Variations

2014 ◽  
Author(s):  
Yacine Aïıt-Sahalia ◽  
Jean Jacod
Keyword(s):  
Asymptotic Behavior ◽  
Rate Of Convergence ◽  
Method Of Moments ◽  
Generalized Method Of Moments ◽  
Parametric Estimation ◽  
Continuous Part ◽  
Moment Functions ◽  
The Law

This chapter studies the simplest possible process having both a non-trivial continuous part and jumps. It starts with the asymptotic behavior of power variations when the model is nonparametric, that is, without specifying the law of the jumps. This is done in the same spirit as in Chapter 3: the ideas for the proofs are explained in detail, but technicalities are omitted. Then, it considers the use of these variations in a parametric estimation setting based on the generalized method of moments. There, it considers the ability of certain moment functions, corresponding to power variations, to achieve identification of the parameters of the model and the resulting rate of convergence. It shows that the general nonparametric results have a parametric counterpart in terms of which values of the power p are better able to identify parameters from either the continuous or jump part of the model.

Using information from singletons in fixed-effects estimation: xtfesing

2020 ◽  
Vol 20 (4) ◽  
pp. 965-975
Author(s):  
Laura Magazzini ◽  
Randolph Luca Bruno ◽  
Marco Stampini
Keyword(s):  
Panel Data ◽  
Method Of Moments ◽  
Fixed Effects ◽  
Generalized Method Of Moments ◽  
Panel Data Regression ◽  
Data Regression ◽  
Method Of Moments Estimator ◽  
Fixed Effects Estimation

In this article, we describe the xtfesing command. The command implements a generalized method of moments estimator that allows exploiting singleton information in fixed-effects panel-data regression as in Bruno, Magazzini, and Stampini (2020, Economics Letters 186: Article 108519).

Does Bank Profitability Stimulate Economic Growth in the Arab Region?

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Omar Ghazy Aziz
Keyword(s):  
Financial Development ◽  
Method Of Moments ◽  
Positive Impact ◽  
Generalized Method Of Moments ◽  
Arab Countries ◽  
Return On Assets ◽  
Bank Profitability ◽  
Arab Region ◽  
Return On Equity ◽  
The Impact

AbstractThis study empirically investigates the impact of bank profitability, as a complementary measure of financial development, on growth in the Arab countries between 1985 and 2016. Using a generalized method of moments (GMM) estimation to test the impact of the bank profitability on growth, this study utilises two variables in the econometric model which are return on assets and return on equity. This study reveals that both variables of bank profitability are positive and significant. This confirms that the bank profitability, beside other financial development variables, has positive impact on the growth. This study points out some important implications based on this result.

Assessing the bank profitability in the MENA region

2014 ◽  
Vol 7 (3) ◽  
pp. 305-332 ◽  
Author(s):  
Rim Ben Selma Mokni ◽  
Houssem Rachdi
Keyword(s):  
Method Of Moments ◽  
North Africa ◽  
Banking Sector ◽  
Middle Eastern ◽  
Generalized Method Of Moments ◽  
Mena Region ◽  
Bank Profitability ◽  
Content Type ◽  
Conventional Banks ◽  
Econometric Technique

Purpose – Which of the banking stream is relatively more profitable in Middle Eastern and North Africa (MENA) region? Design/methodology/approach – The empirical study covers a sample of 15 conventional and 15 Islamic banks for the period 2002-2009.The authors estimate models using the generalized method of moments in system, of Blundell and Bond (1998). They exploit an up-to-date econometric technique which takes into consideration the issue of endogeneity of regressors to evaluate the comparative profitability of Islamic and conventional banks in the MENA region. Findings – Empirical analysis results show that the determinants’ significance varies between Islamic and conventional banks. Profitability seems to be quite persistent in the MENA region reflecting a higher degree of government intervention and may signal barriers to competition. Originality/value – The main interest is to develop a comprehensive model that integrates macroeconomic, industry-specific and bank-specific determinants. The paper makes comparison of the performance between two different banking systems in the MENA region. The authors consider a variable crisis to gain additional insights into the impacts of the financial crisis on MENA banking sector.

scholarly journals Asymptotic Properties of Multicolor Randomly Reinforced Pólya Urns

2014 ◽  
Vol 46 (02) ◽  
pp. 585-602 ◽  
Author(s):  
Li-Xin Zhang ◽  
Feifang Hu ◽  
Siu Hung Cheung ◽  
Wai Sum Chan
Keyword(s):  
Asymptotic Behavior ◽  
Rate Of Convergence ◽  
Clinical Studies ◽  
Asymptotic Properties ◽  
Important Application ◽  
Urn Models ◽  
Theoretical Justification ◽  
Treatment Allocation ◽  
Number Of Patients ◽  
Generalized Pólya Urn

The generalized Pólya urn has been extensively studied and is widely applied in many disciplines. An important application of urn models is in the development of randomized treatment allocation schemes in clinical studies. The randomly reinforced urn was recently proposed, but, although the model has some intuitively desirable properties, it lacks theoretical justification. In this paper we obtain important asymptotic properties for multicolor reinforced urn models. We derive results for the rate of convergence of the number of patients assigned to each treatment under a set of minimum required conditions and provide the distributions of the limits. Furthermore, we study the asymptotic behavior for the nonhomogeneous case.

The impact of urbanization on energy consumption and efficiency

2017 ◽  
Vol 28 (7) ◽  
pp. 673-686 ◽  
Author(s):  
Pengfei Sheng ◽  
Yaping He ◽  
Xiaohui Guo
Keyword(s):  
Energy Consumption ◽  
Method Of Moments ◽  
Energy Use ◽  
Generalized Method Of Moments ◽  
Method Of Moments Estimation ◽  
Process Of Urbanization ◽  
Per Capita ◽  
Using Data ◽  
Impact Of Urbanization ◽  
The Impact

There is no consensus about the impact of urbanization on energy efficiency. We seek to fill this gap in literature using data from 78 countries for the period of 1995 through 2012. Extending the Stochastic Impacts by Regression on Population, Affluence, and Technology model, we identify the impact of urbanization on energy consumption and efficiency. Results of generalized method of moments estimation indicate that the process of urbanization leads to substantial increases in both the actual and the optimal energy consumption, but a decrease in efficiency of energy use. In addition, we find that the extent to which energy inefficiency correlates with urbanization is greater in countries with higher gross domestic product per capita.

scholarly journals Factors Influencing Auditor Independence among Listed Companies in Nigeria: Generalized Method of Moments (GMM) Approach

2017 ◽  
Vol 9 (8) ◽  
pp. 191 ◽  
Author(s):  
Mary Kehinde Salawu
Keyword(s):  
Method Of Moments ◽  
Stock Exchange ◽  
Generalized Method Of Moments ◽  
Secondary Data ◽  
Audit Fees ◽  
Listed Companies ◽  
Positive Influence ◽  
Auditor Independence ◽  
Financial Reports ◽  
Factors Influencing

The study examines the factors influencing auditor independence among listed companies in Nigeria. A sample of 65 firms out of the 194 listed on the Nigerian Stock Exchange (NSE) were purposively selected for analysis, these comprise 14 money deposit banks (financial), 1 mortgage bank and 50 non-financial firms. Secondary data were employed for the study and were sourced from the audited financial reports of sampled companies and fact book of the Nigerian Stock Exchange between the periods of 2006 and 2013. Data were analysed using descriptive statistics and Generalised Method of Moments (GMM). Preliminary tests were carried out such as Sargan test, Arellano-Bond Serial Correlation Test among others. The study revealed that Big4, audit tenure, profitability, leverage and inventory with account receivable had negative significant impact, which can impair auditor independence, while size of the firms and loss had positive influence on auditor independence in Nigeria. Also, the square root of the number of subsidiaries was positively related to auditor independence, but not significant and the total number of subsidiaries had positive influence on auditor independence but not significant. These results implied that the two variables can increase the complexity of the audit and, consequently, a rise in audit fees expect in their presence. This will in turn reduce auditor independence. The study therefore recommended that joint audit be adopted and audited tenure be reviewed. The findings of the study would enable management, regulators, investors and other stock market participants to play their unique and important roles in enhancing auditor independence in Nigeria.

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