Humboldt-Universität zu Berlin | Wirtschaftswissenschaftliche Fakultät | High Dimensional Nonstationary Time Series | About us | News Feed | News 2014 | Dissertation: Piotr Majer completes PhD Dissertation: Piotr Majer completes PhD 12.12.2014. Piotr Majer successfully finished his PhD dissertation on "Dynamic Semiparametric Factor Model in Applications to fMRI and Interest Rates". Congratulations!