List of Articles Bahman Banimahd

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  1 - Study and Research on the Six-Year Process of Bitcoin Price and Return
  Mehrzad Alijani Bahman Banimahd Mehdi Madanchi
  10.22034/amfa.2019.577434.1126
  The purpose of this study, is create a challenge and discussion concerning the existence of information about the Bitcoin price and return, which suggests the relationship of information and the strong performance it. The information trends are available at different ti More

  The purpose of this study, is create a challenge and discussion concerning the existence of information about the Bitcoin price and return, which suggests the relationship of information and the strong performance it. The information trends are available at different time periods and the summary data related to the statistical descriptions for the price and return index are also discussed. In this paper we show a significant correlation between the price trend and return in the Bitcoin that has been confirmed by various statistical methodology. Using statistical tests and reviewing trends and relationships between the variables, planning can be done to invest in it and its performance or inefficiency can be tested. The results of this research shows a significant and positive relationship between the price and return of Bitcoin. Manuscript profile
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  2 - The Ranking of Fraudulent Financial Reporting By Using Data Envelopment Analysis: Case of Pharmaceutical Listed Companies
  Bahman Banimahd
  10.22034/amfa.2019.1863571.1193
  Fraudulent financial reporting has been one of the most sensitive issues on the business world. Financial statements that conceal the company's facts have caused great losses to its stakeholders. The ranking of companies based on fraudulent financial reporting is one of More

  Fraudulent financial reporting has been one of the most sensitive issues on the business world. Financial statements that conceal the company's facts have caused great losses to its stakeholders. The ranking of companies based on fraudulent financial reporting is one of the key issues for performance analysis. This study, by using financial variables and the data envelopment analysis methodology, ranked the pharmaceutical companies listed on the Tehran Stock Exchange in terms of fraudulent financial reporting. The data and theoretical framework of the research are based on library studies and data analysis has been done based on the data envelopment analysis model. The results of this study indicate that the most manipulation of profits in 2015 was in the Daru Amin and Faravordehaye Tazrighi companies, as well as Iran Daru and Sina Daru in 2016. This will lead to the companies being ranked at the highest level of fraudulent financial reporting. Manuscript profile
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  3 - The Role of Earnings Management in Economic Growth and Corporate Growth Illusion
  Leila Zamanianfar Fraydoon Rahnamay Roodposhti Bahman Banimahd Hashem Nikoomaram Zahra Deilami
  10.22034/amfa.2020.1900232.1430
  The most comprehensive criteria for evaluating management performance is economic value added, accounting added value, and over-valuation, which can best reflect how managers operate because of the information content that they provide. Therefore, considering the import More

  The most comprehensive criteria for evaluating management performance is economic value added, accounting added value, and over-valuation, which can best reflect how managers operate because of the information content that they provide. Therefore, considering the importance of earnings, this study investigates The Role of Earnings Management in Economic Growth and the Corporate’s Growth Illusion in Tehran Stock Exchange during the period 2012-2018 using systematic elimination method of information of 150 selected companies. The study data and theoretical foundations were collected through library studies. Hypotheses were tested using correlation method and multivariate regression. The results showed that with increasing in real earnings management, economic value added and accounting added value also increased. Also, with the increase in revenue earnings management, economic value added and accounting added value also increase. But there was no significant relationship between accrual earnings management and income with accounting added value. There is a positive significant relationship between actual earnings management resulting from abnormal and overvaluation operating cash flows and, there is a positive and significant relationship between accrual earnings management and overvaluation. Manuscript profile
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  4 - New Criterion‎ For Fractal Parameter In Financial Time Series ‎
  Mehrzad Alijani bahman banimahd Ahmad Yaghobnezhad
  10.22034/amfa.2021.1917040.1527
  Since calculating the amount of fractal in the ARFIMA time series and increasing its ‎accuracy and bring it closer to reality is very important, this article intends to ‎investigate the possibility of modifying this computational formula by changing the ‎foc More

  Since calculating the amount of fractal in the ARFIMA time series and increasing its ‎accuracy and bring it closer to reality is very important, this article intends to ‎investigate the possibility of modifying this computational formula by changing the ‎focus criterion and using simulation. In the present paper, by analysing and ‎simulating the fractal parameter for time series ARFIMA model and redefining and ‎reviewing the Fractal mathematical, a fractal calculus and dimension in ‎comparison ‎with Euclidean norms introduced. In this regard, first, a new criterion about fractal ‎or Hausdorff ‎component for measuring the forms of fractal time series introduced, ‎then the effects and functional ‎inquiries using simulation data searched, and some ‎mathematical proofs through simulation of ‎data achieved. The findings showed that, ‎the deviation of the new estimator from the simulated initial value is less, and closer ‎to reality as this new criterion introduced by changing the focus criterion and ‎replacing the mean with the median due to less sensitivity to out-dated data. The ‎new criterion is better for determining the fractal parameter and identifying its ‎degree of effectiveness. Finally, the findings empirically indicated that the proposed ‎criterion is more efficient and better ‎than the others for calculating fractal ‎dimensions.‎ Manuscript profile