@article{Paccagnella2006,
author = {Paccagnella, O.},
title= {Centering or not centering in multilevel models? The role of the group mean and assessment of group effects},
year = {2006},
doi = {10.1177/0193841X05275649},
journal = {Evaluation Review},
volume = {30},
number = {1},
pages = {66‒85},
}