Modeling of financial markets volatility is one of the most significant issues of contemporary finance, especially with regard to analyzing high-frequency data. Accurate quantification and forecast of volatility are of immense importance in risk management (VaR models, stress testing and...

This paper focuses on volatility of financial markets, which is one of the most important issues in finance, especially with regard to modeling high-frequency data. Risk management, asset pricing and option valuation techniques are the areas where the concept of volatility estimators...

This paper investigates some early outcomes of the reform to lower the school starting age in Poland. It explores data on the school performance of 6- and 7-year-old pupils, collected in the transitory period of the reform, when parents were welcomed to enroll their 6-year-old children in the...

This paper studies flows on the labour market in Poland in 1995-2008. We show that the main driving force behind the unemployment rate is the behaviour of outflow to employment. In addition, this flow is found to be procyclical, while the separation rate is acyclical.