Calendar anomalies among food sector companies listed on the Warsaw Stock Exchange
Calendar anomalies among food sector companies listed on the Warsaw Stock Exchange

Summary/Abstract: One of the types of anomalies in the capital market are calendar anomalies. They are associated with the occurrence of various calendar relationships in the rates of return. The aim of this study is to examine whether calendar effects occur for companies in the food industry and the WIG-food index. More specifically, the article examines the occurrence of such anomalies for 14 companies in the food industry and the WIG-food index. It focuses on the effects of the day of the week, the month of the year and the half of the year. The study covers the period from December 2007 to January 2019, divided into three shorter sub-periods, and uses daily percentage logarithmic return rates. The method applied is a linear regression model, and the data was drawn from the stooq.pl website. The day of the week effect was found for Wawel in the 1st examined sub-period and for Astarta in the 2nd sub-period. The effect of the month of the year was observed for Pamapol and Seko in the 1st sub-period. The effect of the half of the year did not occur for any of the surveyed companies. Particular statistically significant variables indicate the presence of variability over time, both in the case of days of the week and months of the year. What was also observed was diminishing of the above-mentioned effects from period to period.

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