Lídia Matos, Irene Morgado, Luís Santos, Rui Camisa, Paulo Benvindo, Paulo Pereira
A targeted survey on teachers' perception of training/education for blood donation in high school students: An invited case report for enhancing and retention of dedicated donors in Portugal
Transfusion and apheresis science : official journal of the World Apheresis Association : official journal of the European Society for Haemapheresis
summary multilevel modelling sometimes used data complex surveys involving multistage sampling unequal sampling probabilities stratification consider generalized linear mixed models particularly case dichotomous responses pseudolikelihood approach accommodating inverse probability weights multilevel models arbitrary number levels implemented using adaptive quadrature sandwich estimator used obtain standard errors account stratification clustering level 1 weights used vary elementary units clusters scaling weights becomes important point variance components also regression coefficients severely biased response dichotomous pseudolikelihood methodology applied complex survey data reading proficiency american sample program international student assessment 2000 study using stata program gllamm estimate wide range multilevel latent variable models performance pseudomaximumlikelihood different methods handling level 1 weights investigated monte carlo experiment pseudomaximumlikelihood estimators conditional regression coefficients perform well large cluster sizes biased small cluster sizes contrast estimators marginal effects perform well situations conclude caution must exercised pseudomaximumlikelihood estimation small cluster sizes level 1 weights used