Maintenance: On Tuesday, February 12, 2019, maintenance work on some network components is scheduled from 19:45-22:30 hrs. ZORA will not be available during this period.
Afshartous, David; Wolf, Michael (2007). Avoiding "data snooping" in multilevel and mixed effects models. Journal of the Royal Statistical Society: Series A, 170(4):1035-1059.
Afshartous, David; Wolf, Michael (2005). Avoiding Data Snooping in Multilevel and Mixed Effects Models. Working paper series / Institute for Empirical Research in Economics No. 260, University of Zurich.