Biotechnology is considered as one of the key high-technology sectors in the future. It has been increasingly accepted that small, innovative businesses were the major stimulus for the development of this emerging industry. Many studies on new entrepreneurial entrants in biotechnology are mainly...

Unit root tests for time series with level shifts are considered. The level shift is assumed to occur at a known time point. In contrast to some other proposals the level shift is modeled as part of the intercept term of the stationary component of the data generation process which is separated...