For proper valuation of risk to which the portfolio of financial assets is exposed, it is necessary to forecast the second moments of financial time series, that is variabilities. The empirical investigations show that financia time series are heteroskedastic, i.e. their volatility is not...

English Abstract: Situation and trends in the sector of un/employment of workforce are conditioned primarily by global trends, but they also express the content of economic and political measures that are undertaken in each country, both in the field of economic development, as well as in the...