This analysis explores the application of Linear Mixed Models (LMM) to hierarchical education data from the Junior School Project (JSP) dataset. The study compares two estimation approaches for variance components: Maximum Likelihood (ML) and Restricted Maximum Likelihood (REML). Using both full sample and reduced (small sample) data, the analysis demonstrates how ML and REML behave under different sample sizes, with particular emphasis on the estimation of between-school variance and the Intraclass Correlation Coefficient (ICC). Results show that while ML and REML produce nearly identical estimates in large samples, ML tends to underestimate variance components in smaller samples. REML provides more stable and theoretically less biased estimates, especially when the number of clusters is limited.

Pemodelan Quasi Likelihood dengan menggunakan Quasi Binomial pada data Leafblotch.