Advanced Grouping

Grouping by arrival time group_by_arrival_time = True

We can group participants by arrival time by setting the attribute group_by_arrival_time = True directly under a WaitPage.

Things to consider

  • group_by_arrival_time is defined on under a page class, unlike previous matching commands.

  • group_by_arrival_time copies the group structure to future rounds. If a group is rematched, the value is overwritten.

  • group_by_arrival_time works only if the WaitPage is the first page in the app

  • You can use is_displayed to keep the group structure in the first round only (but every player should see the page)

     class GroupPage(WaitPage):
         group_by_arrival_time = True
         def is_displayed(self):
             return self.round_number == 1
  • If group_by_arrival_time = True all players will be initially in the same group when creating_session runs.

  • id_in_group is not assigned in order participants arrive

  • A group’s id_in_subsession is not necessarily goes from 1 to number of groups. In each grouping a new number is created.