In modern portfolio theory investment risk plays a crucial role. It is the subject of numerous studies and publications, in particular in relation to the management of investment portfolios. Commonly used measure of investment management in equities is a beta parameter, which is used to estimate individual stock risk and portfolio risk. In particular, numerous studies are subject to the beta parameter properties such as stability in the context of the stock market cycle phases, intervaling effect, length estimation sample etc.

1. PRESENTATION: Intervaling effect on estimating beta parameter for the largest companies on the WSE, Microsoft Office Document, 1.2MB

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1. Statistical properties of returns for stocks listed on WSE in period 2005-2015