Member groups and selectors

Selectors identify model variables by their dimensions and members. A selector contains dimension and exactly one selection form.

Select all regions

selectors:
  - dimension: regions
    members: all

Select named regions

selectors:
  - dimension: regions
    members: [USA, CHN, JPN]

Reuse a member group

member_groups:
  focus_regions:
    members: [USA, CHN, JPN]

layers:
  - id: policy
    name: Policy adjustment
    data_file_name: policy.csv
    event_year: 2026
    description: Policy adjustment in selected regions
    shocks:
      - variable_prefix: INFX
        selectors:
          - dimension: regions
            member_group: focus_regions
        value_path:
          type: permanent_constant
          value: 1.0
          units: percentage points

A member group has no dimension. The same group can be checked against regions, orig or dest where the selected variable supports that dimension.

For bilateral variables, exclude_equal_member_pairs can remove combinations where the two named dimensions have the same member.

Every code, prefix and dimension is checked against the selected model.