---
visualization:
  - !grouped_histogram
    name: "Example_grouped_histogram"
    dataset: "data"
    group_by: 'user_id'
    aggregation_variable: 'bayes-corrected (q=0.25) valence'
    aggregation_function: 'mean'
    x_axis_label: 'Valence'
    y_axis_label: 'Number of users'
    title: 'Histogram of Mean Valence per User'
...