Why are statistics sometimes different in different sources in the capital market? Ali Zarkash, CEO of the Technology Management Company of the Tehran Stock Exchange, in the 21st part of the stock clinic, referring to the difference in the data published from statistical data of the capital market in various sources, said: Differences in the references used, calculation formulas and items included in the indices are among the causes of the differences in the published data. Emphasizing the position of the Technology Management website of the Tehran Stock Exchange (TSETMC) as the official source of information on transactions in the capital market, Zarkash presented this system as a reliable source for public access to market data. The 21st episode of will be published soon on the news website of the Capital Market of Iran (SANA).