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Three level HLM null model
Multilevel modeling using SPSS (July, 2019)
Illustration of HLM program (by SSI) with multilevel data
Multilevel modeling (two-levels) in R with 'lme4' package (May, 2019)
Inferential Analysis of Quantitative Survey Data
Introduction to multilevel linear models in Stata®, part 1: The -xtmixed- command
12 year old sentenced to life in prison
Multilevel models in R