Test for free-riding behavior, results from multilevel logistic regressions.
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*P<0.05, ** P<0.01, ***P<0.001 aNo formal statistical test was conducted to test if the random effect equals to zero. Observations from Round 2 to Round 24 were used for the analysis. The random effect at the group level was not shown as it was estimated as zero.
创建时间：
2014-01-24
