Panel data are specific data where cases are observed at two or more time periods. This approach brings many advantages: larger dataset, decreasing collinearity between exogenous variables and using advanced econometric models. The panel data models were applied to data from the Household Budget...

Estimation of volatility of financial time series plays a crucial role in pricing derivatives. Volatility is often estimated from historical data; however, it is well known that volatility varies in time. We propose a method to choose a suitable length of historical data to estimate contemporary...