Year | Self-serving attribution sample | Non-self-serving attribution sample | Inter-group differences | ||
number | mean | number | mean | ||
2015 | 533 | 0.071 | 219 | 0.106 | −0.035*** |
2016 | 550 | 0.070 | 206 | 0.090 | −0.021** |
2017 | 443 | 0.049 | 227 | 0.086 | −0.037*** |