Participant grouping

Participant grouping in GazePlotter allows you to organize participants into custom groups for comparative eye-tracking analysis. The interface provides advanced group management with search filtering, bulk operations, and change tracking for efficient data organization.

Accessing participant grouping

To manage participant groups:

1. Click on the More options button in the top right corner of any plot.
2. Select Setup participant grouping from the pop-up menu.

Group Management

Adding Groups

• Click Add group to create a new group
• Groups are automatically named "Group 1", "Group 2", etc.
• Each group gets the lowest available ID number

Group Properties

For each group you can:

• Edit name - Click in the group name field to rename
• View participant count - Shows "X/Y participants" (selected/total)
• Reorder groups - Use up/down arrows to change group order
• Delete groups - Click the trash icon to remove a group

Group Accordion Interface

• Click the participant count button to expand/collapse each group
• Expanded groups show detailed participant management options
• Multiple groups can be expanded simultaneously

Participant Selection

Individual Selection

• Each participant has a checkbox within expanded groups
• Check/uncheck to add/remove participants from groups
• Participants can belong to multiple groups simultaneously

Search Filtering

• Use the "Search participants" field to filter the participant list
• Search is case-insensitive and matches participant names
• Hidden participants counter shows how many are filtered out
• Important: Selections persist when search is cleared

Bulk Operations

Within each group:

• Select visible - Adds all currently visible (filtered) participants to the group
• Deselect visible - Removes all currently visible participants from the group
• These operations respect the current search filter

Change Tracking

The interface tracks all modifications:

• Unsaved changes are highlighted with enabled Save/Discard buttons
• Auto-detection of changes to group names, participants, or order
• Change persistence - Modifications are preserved until saved or discarded

Saving Changes

• Save - Applies all changes and updates visualizations
• Discard Changes - Reverts to the last saved state
• Both buttons are disabled when no changes are pending

Tips for Effective Grouping

• Search before bulk operations - Filter participants before using "Select visible" for targeted group building
• Multiple group membership - Participants can belong to several groups for different analyses
• Persistent selections - Use search to verify group membership without losing selections
• Group ordering - Arrange groups in logical order for easier navigation in visualizations