| coefficient | value | t-stats | p |
2011 | α | 8.29 | 9.21 | 1.76e−15 |
β | 0.166 | 0.408 | 0.684 | |
γ | −1.43 | −5.97 | 2.66e−8 | |
2012 | α | 7.50 | 8.30 | 2.17e−13 |
β | 0.0812 | 0.202 | 0.841 | |
γ | −1.24 | −5.25 | 7.02e−7 | |
2013 | α | 12.9 | 9.50 | 2.95e−16 |
β | −0.368 | −0.625 | 0.533 | |
γ | −2.39 | −6.80 | 4.37e−10 |