اندازه گیری سطح عدم تقارن اطلاعات برای شرکت های منتخب فعال در بورس اوراق بهادار تهران: احتمال مبادله آگاهانه(PIN)

نویسندگان
مولود رحمانیانی
رضا طالبلو
دانشگاه علامه طباطبائی
10.29252/jemr.8.29.73
چکیده
سطح نامتقارن بودن اطلاعات در بازارهای مالی به دلیل تاثیر آن در تشکیل بازار، سطح قیمت‌ها و تعامل آن با ریسک سرمایه‌گذاری از اهمیت بسیاری برخوردار می‌باشد. همچنین تعیین قوانین بهینه از سوی سیاست‌گذاران و تعیین استراتژی معاملاتی از سوی سرمایه‌گذاران با در نظر گرفتن میزان تقارن اطلاعات در بازار صورت می‌گیرد. در ادبیات مالی برای اندازه‌گیری میزان نامتقارن بودن اطلاعات در بازار معیارهای متعددی مطرح شده است که اغلب آنها بر گستره خرید-فروش مبتنی هستند. طی سال-های اخیر معیار دیگری تحت عنوان احتمال مبادله آگاهانه(PIN) برای اندازه‌گیری میزان نامتقارن بودن اطلاعات معرفی شده است که مبتنی بر الگوهای اقتصادی و در چارچوب ساختار خردی بازار می‌باشد. مقادیر بزرگ‌تر PIN در دامنه 0 تا 1 بیانگر وجود اطلاعات محرمانه بیشتر یا سطح عدم تقارن اطلاعاتی بالاتر است. در این پژوهش با بهره‌گیری از رویکرد ایزلی و اوهارا (1992) معیار احتمال مبادله آگاهانه به عنوان معیاری از سنجش سطح نامتقارن بودن اطلاعات بازار برای 12 شرکت منتخب از شرکت‌های فعال در بورس اوراق بهادار تهران به تفکیک صنایع تخمین‌زده شده است. سپس جهت بررسی اعتبار روش مورد استفاده، پارامترهای مربوط به معیار نامتقارن بودن اطلاعات با نتایج پژوهش‌های مشابه در خارج از کشور مورد مقایسه قرار گرفته و سپس به تحلیل تفاوت میان شرکت ها و صنایع پرداخته شده است. نتایج تخمین در این مقاله نشان می‌دهد که احتمال آگاهانه در طول زمان متغیر بوده و برای صنایع مختلف متفاوت می‌باشد به طوری که میانگین این معیار برای شرکت های مختلف از 35/0 تا 40/0 متغیر است.
کلیدواژه‌ها
عدم تقارن اطلاعات
ریز ساختار بازار
معیار احتمال مبادله آگاهانه (PIN)

عنوان مقاله English

Measuring Probability of Informed Trading in Tehran Stock Exchange

نویسندگان English

Moloud Rahmaniani
Reza Taleblo
Allameh Tabatabii University
چکیده English

The level of asymmetric information in financial markets is important for its impact on the market formation, price levels and its interaction with investment risk. Also, determining the optimal rules by policy makers and determining the trading strategy by investors is done according to the level of information symmetry in the market. In financial literature, many metrics have been developed to measure the asymmetry of market information. In recent years, another measure known as probability of informed trading (PIN) has been introduced to measure the level of asymmetric information, based on the framework of market microstructure. Larger PINs from 0 to 1 range indicate higher information asymmetry levels. In this study, using the Easley, O'Hara (1992) approach, the probability informed trading as a measure of the level of market information asymmetry for the 12 selected companies from listed companies in Tehran Stock Exchange is estimated. We used maximum likelihood to estimate parameters with R package. The results show that average of PIN varies from 0.35 to 0.4 for different companies.

کلیدواژه‌ها English

Asymmetric Information
Market Microstructure
Probability of Informed Trading
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