An analysis of US and Slovenian vacancy data sets reveals that an employer who is searching to fill a job vacancy is more likely to fill the vacancy by hiring an under-qualified worker when the search costs are higher; when, at the start of the search, the employer has less time to search at low...

An increasing variety of data frequencies available in economics, finance, etc. gives rise to a question how to build and estimate a regression model with variables observed at different frequencies. In a unifying framework of ("m,d")-aggregation we consider various approaches by discussing some...