Table 4. Estimates of the input coefficients in the I-district fixed effects.
|
________________(1.1) |
(1.2) |
_____________(1.3) |
(1.4) |
(1.5) |
(1.6) | |
|
Constant |
5.1464 *** |
5.5055 *** |
5.5861*** |
4.7451*** |
4.7635*** |
4.8347*** |
|
(0.000) |
(0.000) |
(0.000) |
(0.000) |
(0.000) |
(0.000) | |
|
R&D firms (1) |
0.2635 *** |
0.2825 *** |
0.2751*** | |||
|
(0.000) |
(0.000) |
(0.000) | ||||
|
R&D firms (2) |
0.0905*** |
0.0970*** |
0.0943*** | |||
|
(0.000) |
(0.000) |
(0.000) | ||||
|
R&D public |
0.1902 *** |
0.2441 *** |
0.2485*** |
0.2061*** |
0.2328*** |
0.2187*** |
|
___________(0.001) |
(0.000) |
________(0.000) |
(0.001) |
(0.000) |
(0.000) | |
|
Territory and |
Territory and | |||||
|
Fixed effects |
Territory |
Industry |
Industry |
Territory |
Industry |
Industry |
|
Fixed effects F-test |
0.000 |
0.000 |
0.000 |
0.000 |
0.000 |
0.000 |
|
LR selection (Iambda=O)_________ |
_____________0.000 |
0.0001 |
________0.0002 |
0.0003 |
0.0003 |
0.0008 |
|
R2-ajd / Pseudo R2 |
0.297 |
0.3225 |
0.3283 |
0.3111 |
0.3315 |
0.3371 |
|
Log-L |
-681.46 |
-670.24 |
-658.20 |
-679.82 |
-666.19 |
-654.26 |
|
Akaike |
1370.91 |
1378.473 |
1390.40 |
1379.64 |
1370.39 |
1382.53 |
|
BIC |
1388.50 |
1462.015 |
1553.08 |
1423.61 |
1453.93 |
1545.22 |
|
Number of obs________________ |
_____________806 |
_______806 |
___________806 |
_______806 |
806 |
_________806 |
(1) R&D imputed from regional data
(2) R&D from firm microdata
Notes: (a) Dependent variable = Patents per employee in the 2001-2006 period; (b) All variables are natural logarithms; (c) P-values are in parentheses and
asterisks represent statistical significance at 1% (***), 5% (**) and 10% (*); (d) Within group effect model estimates; (e) Fixed effects provided under the
restriction that ∑ αi = 0, so that the dummy coefficients mean deviations from the averaged group effect (intercept); (f) Heckman two stages coefficients
adjusted for sample selection; (g) Robust Huber-White estimators when slight problems of heteroskedasticiy, collinearity or outliers are detected.
18