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Rasbah, J., Steele, F., Browne, W. and Goldstein, H. (2009) A user’s guide to MLwiN, version 2.10. . Centre for Multilevel Modelling, University of Bristol, Bristol, UK. ISBN 9780903024976
Pfeffermann, Danny, Skinner, Chris J., Holmes, D. J., Goldstein, H. and Rasbash, J. (1998) Weighting for unequal selection probabilities in multilevel models. Journal of the Royal Statistical Society. Series B: Statistical Methodology, 60 (1). pp. 23-40. ISSN 1369-7412