I have a hierarchical design where politicians where each asked 9 randomly chosen questions from a pool of 18 questions. Therefore, the questions are crossed with politicians. Furthermore, the politicians are nested in districts. So I want to fit crossed random effects for politicians and questions and a nested random effect for politicians within districts.

Would the following syntax fit such a model?

Code:
mixed ... || district: || _all: R.politician || _all: R.question
Thanks for your help.