Multilevel factor models for ordinal variables Leonardo Grilli Carla Rampichini Department of Statistics ‘Giuseppe Parenti’ University of Florence e-mail: grilli@ds.unifi.it, carla@ds.unifi.it Phone: +39 0554237271, +39 0554237246 Final versione printed as: . Grilli L. & Rampichini C. (2007) Multilevel factor models for ordinal variables. Structural Equation Modeling, 14 (1), pp 1-25 . http://www.leaonline.com/doi/abs/10.1207/s15328007sem1401_1