This research study on the adaptation of the securities to profit whose purpose is to test the value of the information announced quarterly profits of companies listed on the Stock Exchange of Thailand, using quarterly data listed companies in the year. Prof. 2555 using the event (Event study) to measure the return that is not normal, it's the return of the actual net returns are expected, which is calculated on the Market Model (Market Model). The profits will be divided according to the type of news Foster Olsen and Shevlin (1984).
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