from otree.api import * class C(BaseConstants): NAME_IN_URL = 'public_goods_simple' PLAYERS_PER_GROUP = 3 #1グループ何人か NUM_ROUNDS = 3 #ラウンド数は何回か ENDOWMENT = cu(100) #初期保有はいくらか MULTIPLIER = 1.8 #公共財の係数 class Subsession(BaseSubsession): pass class Group(BaseGroup): total_contribution = models.CurrencyField() #投資合計額 individual_share = models.CurrencyField() #投資量からのリターン class Player(BasePlayer): contribution = models.CurrencyField( #投資量 min=0, max=C.ENDOWMENT, label="投資額をいくらにしますか?" ) # FUNCTIONS #def creating_session(subsession): #毎ラウンド異なるマッチング # subsession.group_randomly() #1ラウンド目だけランダムマッチング、その後は固定 def creating_session(subsession): if subsession.round_number == 1: subsession.group_randomly() else: subsession.group_like_round(1) def set_payoffs(group: Group): #1. total_contribution(グループ内の投資額の合計)、individual_share(投資による利益分)を計算 players = group.get_players() contributions = [p.contribution for p in players] group.total_contribution = sum(contributions) group.individual_share = ( group.total_contribution * C.MULTIPLIER / C.PLAYERS_PER_GROUP ) #2. グループ内で各々の利益を計算 for p in players: p.payoff = C.ENDOWMENT - p.contribution + group.individual_share # PAGES class Introduction(Page): @staticmethod def is_displayed(player: Player): return player.round_number==1 class Contribute(Page): form_model = 'player' form_fields = ['contribution'] class ResultsWaitPage(WaitPage): after_all_players_arrive = set_payoffs class Results(Page): @staticmethod def vars_for_template(player): return dict(kept = C.ENDOWMENT - player.contribution) page_sequence = [Introduction, Contribute, ResultsWaitPage, Results]