TY - JOUR A1 - Dedrick, R.F. A1 - Ferron, J.M. A1 - Hess, M.R. A1 - Hogarty, K.Y. A1 - Kromrey, J.D. A1 - Lang, T.R. A1 - Niles, J.D. A1 - Lee, R.S. T1 - Multilevel modeling: A review of methodological issues and applications Y1 - 2009 DO - 10.3102/0034654308325581 JF - Review of Educational Research VL - 79 IS - 1 SP - 69 EP - -102 ER -