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Mixed (aka multilevel or hierarchical) models are linear models that include both fixed effects and random effects. They are used to model longitudinal or nested data.
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LMM for Repeated Measures tree ring chronology
Having my first go at R and stats.
I sampled and analyzed tree rings for different measures (width, density, etc.). There are 3 treatments, 3 plot per treatment, and 5 trees per plot. The ring time se …