Journal of Applied Mathematics / 2015 / Article / Tab 1 / Research Article
Intermediaries in Trust: Indirect Reciprocity, Incentives, and Norms Table 1 Overview of Experiments 1 and 2 results. The AR/FR column presents the ratio between the corresponding results in the alternating and the fixed role experiment. The last two columns present Wilcoxon rank sum tests of the null hypothesis that the result distribution is the same in the two experiments.
Treatment ā Altern. roles Fixed roles AR/FR Wilcoxon ā Mean SE Mean SE Baseline A investments 3.22 0.16 3.07 0.16 1.05 207.5 0.385 B returns 2.00 0.16 3.54 0.26 0.56 142.5 0.079 B ret. (prop.) 0.09 0.01 0.16 0.01 0.56 137.0 0.059 CI 0.50 0.00 0.51 0.00 0.98 319.0 0.118 No incentive A investments 5.07 0.23 3.47 0.12 1.46 174.0 0.029 B returns 6.87 0.42 3.24 0.16 2.12 196.0 0.003 B ret. (prop.) 0.24 0.01 0.14 0.01 1.71 189.0 0.006 CI 0.63 0.01 0.54 0.00 1.17 396.0 0.000 Fixed inc. A investments 3.61 0.21 2.36 0.11 1.53 170.0 0.040 B returns 3.75 0.30 2.47 0.15 1.52 142.0 0.232 B ret. (prop.) 0.17 0.01 0.10 0.01 1.70 150.0 0.153 CI 0.54 0.01 0.52 0.00 1.04 264.0 0.319 A incentive A investments 5.21 0.21 3.96 0.14 1.32 174.5 0.028 B returns 6.42 0.45 5.27 0.27 1.22 147.0 0.180 B ret. (prop.) 0.23 0.01 0.21 0.01 1.10 134.0 0.333 CI 0.60 0.01 0.56 0.01 1.07 365.0 0.002 B incentive A investments 4.50 0.18 3.68 0.14 1.22 154.0 0.121 B returns 4.75 0.28 4.07 0.19 1.17 141.5 0.238 B ret. (prop.) 0.19 0.01 0.18 0.01 1.06 130.0 0.387 CI 0.58 0.01 0.55 0.00 1.05 307.0 0.071