Exercise 9: Nested data and multilevel models

Use data/multilevel_teams.csv.

1. Confirm the number of employees and teams.
2. Calculate average performance by team and create a plot.
3. Identify which variables are Level 1 and which are Level 2.
4. Fit performance ~ 1 + (1 | team_id).
5. Calculate the ICC from the variance components.
6. Fit a model with engagement, autonomy, workload, team climate, and manager support.
7. Fit the same predictors with ordinary lm().
8. Compare at least one standard error between the two models.
9. Explain why employees within the same team may not provide fully independent information.
10. Write a short management interpretation of one Level-1 and one Level-2 coefficient.