In the doctoral dissertation, we consider problems of testing and estimating changed segment with unknown starting position and duration of epidemic state in the autoregressive first-order model. The proposed tests are based on partial sums of model residuals and model-parameter...

Value-at-risk (VaR) model as a tool to estimate market risk is considered in the thesis. It is a statistical model defined as the maximum future loss due to likely changes in the value of financial assets portfolio during a certain period with a certain probability. A new definition of the...

Globalization has changed business environment markedly bringing lots of opportunities as well as much confusion, threats and dependency on global markets of the business. One change of business environment can be replaced by the other that is why nobody can state which international expansion...