Day 12 Practice: Hierarchical (Multilevel) Designs
June 25th, 2025
12.1 Review: Hierarchical Designs
- Remember the definition of experimental unit? The smallest unit to which a treatment is independently applied.
- Sometimes we find that there are different sizes of experimental units.
- In such cases, it is important to identify the different experimental units and the randomization scheme. We may be in front of a multilevel design.
Figure 12.1: Schematic description of a field experiment with a split-plot design
Figure 12.2: Schematic description of a swine experiment with a split-plot design
- Sometimes, these differences in the sizes of EUs are not that easy to notice.
- More details in Analysis of Messy Data - Ch5.
