ترجمه مقاله نقش ضروری ارتباطات 6G با چشم انداز صنعت 4.0
- مبلغ: ۸۶,۰۰۰ تومان
ترجمه مقاله پایداری توسعه شهری، تعدیل ساختار صنعتی و کارایی کاربری زمین
- مبلغ: ۹۱,۰۰۰ تومان
Due to financial globalization, markets become more and more connected and dynamic. So, investors should use methods that allow them to maximize their expected returns in these markets. There exist numerous methods for this end, the most known is Markowitz’s model [1]. It estimates risk and expected returns based on the standard deviation and the expected value of returns. Other methods have aroused to manage and optimize portfolios. Correlation seems to be an important element to study portfolio management; we should have a way to understand interactions among matrices of returns. Numerous methods were proposed to study cross-correlation among series [2–6]. Besides, cross-correlation was also studied among several financial series [6–13]. In this paper, we are interested on another interesting method called Random Matrix Theory (RMT) to study crosscorrelations among stocks of one portfolio. This method was used in nuclear physics by Wigner [14]. It was also used by Dyson and Mehta [15] to explain the energy levels of complex nuclei [16].