# Lecture 15: Mixed models part 1

March 16, 2023 (8th week of classes)**Understanding the hierarchical nature of data - the needs of considering random effects in data and mixed models**

In this lecture we will understand what is meant by the hierarchical nature of data and what are random effects. These principles are required for understanding mixed-model effects.

We will also read parts of the paper “A Brief Introduction to Mixed Effects Modelling and Multi-model Inference in Ecology” by Harrison et al. (2018) posted in Moodle.

**Lecture**