This paper analyzes market efficiency (EMH) with the day-of-the-week effect and the changes that might appear after the outbreak of the COVID-19 pandemic, based on the example of the OMX Exchange and its indices. Before the pandemic, only the OMX Baltic All‑share index was efficient; during...

Long-short anomaly returns are strongly related to the day of the week. Anomalies for which the speculative leg is the short (long) leg experience the highest (lowest) returns on Monday. The opposite pattern is observed on Fridays. The effects are large; Monday (Friday) alone accounts for over...

In this article we test the weak form of the efficient market hypothesis for Central and Eastern Europe (CEE) equity markets for the period 1999-2009. To test weak-form efficiency in the markets, this study uses autocorrelation analysis runs test and variance ratio test. We find that stock...

This paper examines the presence of the day-of-the-week effect in the Italian stock market index (MIB) sub-sectoral returns. The study, by using GARCH-M (1,1) models, did not find evidence of the day-of-the-week effect in mean equations, while some evidence was present in variance equations. The...

Despite recent studies focused on comparing the dynamics of market efficiency between Bitcoin and other traditional assets, there is a lack of knowledge about whether Bitcoin and emerging markets efficiency behave similarly. This paper aims to compare the market efficiency dynamics between...

We examine the well studied Day of the Week effect (DWE), which is for many authors the effect that the day of the week has on the daily differences of the general index (GI). We try to clarify differences between the DWE and the impact that the day has on the GI. We also examine the impact that...

As literature shows, market anomalies in their various forms exist in different markets around the globe. Evidence of seasonality of returns in any form, whether based on time period such as over specific days, weeks and months, or over size, such as large, medium or small or over different...

We calculate the returns for four well-known equity factor returns, the market, size, value, and momentum, for each Zodiac calendar year from 1926 to 2015. We find that point estimates of average returns for each Zodiac sign can be substantially different. However, when we employ statistical...

This paper finds the weekend effect to be a remarkably robust anomaly and refutes the widespread belief that the weekend effect is due to data-mining or a consequence of some unusual/rare events. Out-of-sample analysis finds both the mean and median return on Monday is lower than that on Friday...

This paper examines the calendar anomalies/effects in 55 Stock market exchange indices of 51 countries around the world. The calendar effects which are examined are the turn-of-the-Month effect, the day-of-the-Week effect, the Month-of the-Year effect and the semi-Month effect. The methodology...