Randomise within groups

[Joe Green]

Hi all,

I have a study where two groups will be playing parallel public goods games at the same time. I want to be able to randomise it so that one player in each group gets more in their endowment than the rest of the players.

At present, it seems like I can either have it as a fixed effect where, say, every 3rd person in the group gets the larger endowment. Or, that we randomise it so that any player has a 1 in whatever chance of getting the bonus. Neither of these satisfy what I’m looking for. So my question is: is there a way to ensure that one player in each group gets a larger endowment, but that the order of who gets this is randomised within each group?

Thanks in advance,
Joe

[Chris @ oTree]

def creating_session(subsession):

  for g in subsession.get_groups():

    players = g.get_players()

    for p in players:

      p.endowment = 100

    rich_player = random.choice(players)

    rich_player.endowment = 200