Non-parametric tests
| Risk task | Within-subject | Between-subjects |
|---|---|---|
| L1 (8,0.2,4 | z = 1.34 (p = 0.18) | z = 0.585 (p = 0.55) |
| L2 (9,0.2.,4 | z = 0.94 (p = 0.35) | z = 1.542 (p = 0.123) |
| L3 (6,0.4.,4 | z = −0.97 (p = 0.33) | z = −1.93 (p = 0.23) |
| L4 (9,0.3.,4 | z = −1.00 (p = 0.32) | z = −0827 (p = 0.41) |
| L5 (16,0.2,10 | z = −0.72 (p = 0.47) | z = 0.045 (p = 0.96) |
| Risk task | Within-subject | Between-subjects |
|---|---|---|
| L1 (8,0.2,4 | z = 1.34 ( | z = 0.585 ( |
| L2 (9,0.2.,4 | z = 0.94 ( | z = 1.542 ( |
| L3 (6,0.4.,4 | z = −0.97 ( | z = −1.93 ( |
| L4 (9,0.3.,4 | z = −1.00 ( | z = −0827 ( |
| L5 (16,0.2,10 | z = −0.72 ( | z = 0.045 ( |
Note(s): *p < 0.1, **p < 0.05, ***p < 0.01. Wilcoxon signed rank sum test: the null is that before- and after-treatment measures of risk aversion (risk premia) from subjects assigned to the non-zero increment condition are not significantly different. The Mann-Whitney two-sample test statistic: null is that changes in attitudes to risk (variation in risk premia in a given risk task) across stages among treated (Δw = 7) and untreated (Δw = 0) subjects are not different. ∗ Standard error and p-value in parentheses
Source(s): Table by author
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