Difference-In-Differences Regressions of Halibut Bycatch Rate
| Model 1 | Model 2 | Model 3 | Model 4 | Model 5 | |
|---|---|---|---|---|---|
| Year = 1993 | 2.32 (0.70) | 1.93 (0.67) | 2.02 (0.71) | 1.65 (0.73) | 1.65 (1.28) |
| Year = 1994 | 5.45 (1.62) | 5.36 (1.81)* | 5.19 (1.78)* | 4.32 (1.83)* | 4.32 (2.31)** |
| Year = 1995 | 3.91 (0.81) | 4.81 (1.04) | 4.03 (0.88) | 3.39 (0.87) | 3.39 (1.09) |
| Year = 1996 | 2.04 (0.44) | 3.22 (0.74) | 2.07 (0.46) | 1.80 (0.47) | 1.80 (0.61) |
| Year = 1997 | 2.68 (0.69) | 2.38 (0.65) | 1.14 (0.30) | 0.54 (0.17) | 0.54 (0.20) |
| Year = 1998 | 0.01 (0.00) | −0.84 (−0.23) | −1.98 (−0.51) | −2.14 (−0.67) | −2.14 (−0.76) |
| Year = 1999 | 9.84 (2.15)** | 7.80 (1.75)* | 6.26 (1.32) | 4.12 (1.00) | 4.12 (1.34) |
| Year = 2000 | −0.58 (−0.14) | −1.59 (−0.41) | −2.98 (−0.69) | −2.99 (−0.83) | −2.99 (−1.15) |
| Sea State (=1 if initial member) | −3.84 (−1.64) | −3.82 (−1.73)* | |||
| Horsepower/vessel length | −0.16 (−1.57) | −0.13 (−1.40) | −0.86 (−1.26) | −0.78 (−1.46) | −0.78 (−0.96) |
| Month = May | −3.21 (−1.27) | −3.59 (−1.43) | −5.59 (−2.49)** | −5.59 (−1.33) | |
| Month = June | −3.40 (−1.16) | −4.24 (−1.45) | −5.32 (−2.09)** | −5.32 (−1.01) | |
| Month = July | −6.92 (−2.44)** | −7.15 (−2.54)** | −7.79 (−3.21)*** | −7.79 (−1.44) | |
| Month = August | −12.28 (−5.01)*** | −12.34 (−5.08)*** | −12.97 (−6.25)*** | −12.97 (−2.70)** | |
| Month = September | −14.40 (−5.90)*** | −14.39 (−5.94)*** | −15.58 (−7.53)*** | −15.58 (−3.79)*** | |
| Month = October | −9.48 (−3.70)*** | −9.65 (−3.80)*** | −10.40 (−4.78)*** | −10.40 (−2.38)** | |
| Month = November | −5.10 (−1.64) | −5.44 (−1.76)* | −5.99 (−2.23)** | −5.99 (−1.70) | |
| Sea State * 1995 | 4.72 (0.91) | 4.11 (0.84) | 5.04 (1.03) | 4.35 (1.03) | 4.35 (1.08) |
| Sea State * 1996 | 5.70 (1.08) | 5.69 (1.14) | 6.80 (1.32) | 6.39 (1.47) | 6.39 (1.63) |
| Sea State * 1997 | 2.73 (0.65) | 3.09 (0.79) | 4.21 (1.01) | 4.44 (1.27) | 4.44 (1.63) |
| Sea State * 1998 | 17.12 (3.86)*** | 18.27 (4.40)*** | 18.49 (4.22)*** | 16.95 (4.69)*** | 16.95 (4.14)*** |
| Sea State * 1999 | 13.30 (2.60)*** | 14.86 (3.02)*** | 16.40 (3.10)*** | 17.33 (3.81)*** | 17.33 (2.79)** |
| Sea State * 2000 | 20.61 (4.54)*** | 21.47 (5.04)*** | 22.83 (4.77)*** | 22.10 (5.51)*** | 22.10 (4.54)*** |
| Constant | 10.77 (3.03)*** | 17.92 (4.72)*** | 30.45 (2.92)*** | 30.16 (3.68)*** | 30.16 (2.18)** |
| Observations | 2,784 | 2,784 | 2,784 | 2,784 | 2,784 |
| R2 | 0.06 | 0.09 | 0.1 | 0.13 | 0.13 |
| Estimated ρ | 0.33 | 0.283 | 0.266 | n/a | n/a |