Table 2. Estimates of Cross-State Weed Regulatory Congruence, 1997
|
Slope Coefficients a |
Sign of |
List 1 |
List 2 |
List 3 |
List 4 NW |
|
I1. Average Temperature |
Negative |
4.9813 |
84.4727** |
-21.3807** |
6.1407 |
|
. (3.2738) |
. (4.4132) |
. (3.4548) |
. (7.1744) | ||
|
Positive |
-97.3581** |
-42.5648** |
-79.4742** |
-44.4595** | |
|
(4.7132) |
(7.0742) |
(5.0572) |
(9.1408) | ||
|
I2. Average Precipitation |
Negative |
10 5249** |
7 3781** |
5 1682** |
13 8153** |
|
. (0.6986) |
. (0.8859) |
. (0.7147) |
. (1.3309) | ||
|
Positive |
-22.7889** |
-19.4822** |
-32.4031** |
6.8839 | |
|
(1.9501) |
(2.7352) |
(2.1169) |
(3.9889) | ||
|
I3. Variance of Temperature |
Negative |
0 0018 |
-0 0054 |
0 0074 |
-2 6872** |
|
. (0.0037) |
. (0.0038) |
. (0.0040) |
. (0.5272) | ||
|
Positive |
-6.9931** |
-4.6264* |
-6.1663** |
-11.0265** | |
|
(1.5677) |
(2.2303) |
(1.6542) |
(2.6504) | ||
|
I4. Variance of Precipitation |
Negative |
0 0001* |
-0 0000 |
0 0001** |
-0 0250* |
|
. (0.0000) |
. (0.0000) |
. (0.0000) |
. (0.0114) | ||
|
Positive |
-6.64113** |
-16.6602** |
-5.91907** |
-8.7547** | |
|
(1.51491) |
(2.17302) |
(1.59267) |
(2.89615) | ||
|
I5. Land Share Index |
Negative |
0.0377 |
0.0294 |
0.0122 |
0.0368 |
|
(0.0245) |
(0.0358) |
(0.0229) |
(0.0189) | ||
|
Positive |
-0.0057 |
0.0581 |
-0.0163 |
-0.0665* | |
|
(0.0293) |
(0.0430) |
(0.0274) |
(0.0334) | ||
|
I6. Water Share Index |
Negative |
0 2186 |
0 3907* |
0 1230 |
0 3155 |
|
. (0.1413) |
. (0.1844) |
. (0.1629) |
. (0.4434) | ||
|
Positive |
-0.2210 |
-0.6354** |
-0.1177 |
-0.3793 | |
|
(0.1140) |
(0.1531) |
(0.1319) |
(0.3691) | ||
|
I7. Soil Share Index |
Negative |
0 0203 |
-0 2286 |
0 1888 |
-0 7390 |
|
. (0.1952) |
. (0.2656) |
. (0.2135) |
. (0.4173) | ||
|
Positive |
-0.0570 |
0.4465 |
-0.3991* |
0.1713 | |
|
(0.1679) |
(0.2289) |
(0.1816) |
(0.3871) | ||
|
A1. Field Crop Land Share |
Negative |
3 8381** |
7 9762** |
4 8898** |
2 9998 |
|
. (1.4170) |
. (1.9874) |
. (1.4321) |
. (1.9787) | ||
|
Positive |
-13.3076** |
1.0805 |
-15.4310** |
-18.7375** | |
|
(2.6138) |
(3.7531) |
(2.8232) |
(4.3266) | ||
|
A2. Irrigated Land Share |
Negative |
0 0151 |
-0 0455** |
0 0631** |
0 0287 |
|
. (0.0122) |
. (0.0176) |
. (0.0131) |
. (0.0183) | ||
|
Positive |
-6.8743** |
-3.6522 |
-3.6564* |
-5.2978* | |
|
(1.4686) |
(2.0594) |
(1.5625) |
(2.5443) | ||
|
ωc: Lobby of Consumer |
Negative |
0.0230 |
0.0107 |
0.3081** |
-0.3546** |
|
. (0.0697) |
. (0.0913) |
. (0.0834) |
. (0.1143) | ||
|
Positive |
-5.6111** |
-2.9029 |
-4.0133* |
0.6874 | |
|
(1.6113) |
(2.2071) |
(1.6983) |
(2.7670) | ||
|
ωs: Lobby of Seed Industry |
Negative |
-0.0387 |
0.0162 |
-0.0436 |
0.0465 |
|
. (0.0259) |
. (0.0306) |
. (0.0294) |
. (0.0588) | ||
|
Positive |
-0.0484 |
2.1991 |
1.5123 |
-3.69253 | |
|
(1.4357) |
(2.0100) |
(1.5100) |
(2.4161) | ||
|
ωm: Lobby of Commodity |
Negative |
0.0708 |
-0.1074 |
0.2051* |
-0.5762** |
|
Producer |
(0.0764) |
(0.0902) |
(0.0828) |
(0.1407) | |
|
Positive |
0.3841 |
0.3476 |
-0.6256 |
1.9280* | |
|
(0.5914) |
_________(0.7400) |
_________(0.6747) |
(0.9482) |
** and * denote significance at the 1% and 5% level, respectively; number in parenthesis is standard error.
aI1 through I7 indicate ecological dissimilarity indexes, A1 and A2 are agronomic dissimilarity indexes, and ωk,
k=c,s,m, denote lobbying dissimilarity indexes.
28
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