Which weights to use with multilevel models? A common question with the use of large-scale assessments (LSAs) is related to the use of weights. Another issue is how to specify these weights properly.
Software such as SAS and Mplus, when specifying weights at two levels, require the use of conditional weights at level 1 if the level-2 weight is specified (or you can just use the level-2 weights alone; see Mang et al.