Determining the Effects of Calendrical Anomalies in Automobile Industry Companies Accepted to the Tehran Stock Exchange through Random Dominance Analysis

Today, having enough knowledge and understanding of investors about the existence of anomalies as well as the type of reaction of industries in the capital market can have a major impact on the economic prosperity of the capital market. Therefore, the purpose of this research is to investigate the effect of calendar anomalies on the index returns of companies listed in the Tehran Stock Exchange in the field of automobile industry in the period of 2015-2018. The research was done based on the random dominance analysis method and using the Electra technique, which is a new method in financial research. The findings show that the three main hypotheses that there is a significant difference between the efficiency of the automobile industry index on Saturday to Wednesday, in the first, second, third and fourth weeks of each month and in the months of April to March, all three are rejected. which indicates the inefficiency of automobile industry companies of Tehran Stock Exchange. Also, according to the findings of the research, it was determined that among the days of the week, Saturday and among the weeks of each month, the first week, is the most suitable day and week for investing in the automobile industry. In addition, the best month for investing in the automobile industry is March and the worst month is June.