![]() Subjects make a choice for contributionCalculate the size of the total public contribution and multiply by XReport earnings (endowment kept + share of the public good) to all subjectsBackground StageStage 1Stage 2 Stages of a Simple Public Goods GameSubjects are broken into groups of NSubjects receive their endowment TerminologyStage: In an experiment, one screen display on which a subject can take one or a few actionsTreatment: A related series of stages through which subjects pass can be repeatingSession: A series of treatments all performed on the same subjects in sequence Stages of a Simple Public Goods GameSubjects are broken into groups of NSubjects receive their endowmentSubjects make a choice for contributionCalculate the size of the total public contribution and multiply by XReport earnings (endowment kept + share of the public good) to all subjects(Repeat?) You need to open a new treatment to have the defaults set to English.You must change the language setting every time you open zTree, even if your program was written under the English setting, because otherwise server messages will display in German when you run the program. Programming A Simple Public Goods GameRecall the idea of a Public Goods Game:Some group of people, size N, receive an endowment of moneyEvery person chooses some proportion of their endowment to contributeTotal contributions are multiplied by X > 1, then everyone receives that amount backTotal payoff = (Endowment Contribution) + (X * Total Contributions) / NĬhanging the language setting will not affect currently open treatments. 83-89)Functions and Control Structures (Tutorial pp. 7-16, 77-81)TomorrowRunning Experiments and Recovering Data (Tutorial pp. ![]() Readings to DoTodayBasic Experiments and Questionnaires (Tutorial pp. ![]() What You Will Need to Program in zTreezTree and zLeaf Programs (zTree.exe and zLeaf.exe)Available at Tutorial Manual (ztree21tutorial.pdf)A guided tour of zTrees capabilities more instructionalzTree Reference Manual (ztree21ref.pdf)An organized reference of zTree code What is zTree?Zurich Toolbox for Readymade Economic ExperimentsConsists of two programszTree (the programming environment and experiment server)zLeaf (the client program for subjects)Designed primarily for public goods games, structured bargaining experiments, posted-offer-markets and double auctions ZTree Workshop: Fundamentals of zTreeJustin EsareyFlorida State UniversityDepartment of Political ScienceJuly 11th, 2005 ![]()
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