ANEXOS
125
----------------------------------------------------------------------------------------------------------------------------------------------
Producto |
Coef.
Std. Err.
t
P>|t|
[95% Conf. Interval]
--------------- + -----------------------------------------------------------------------------------------------------------------------
Agua
1.471401 .0506792
29.03
0.000
1.371763
1.571039
d1
7684.684
738.3237
10.41
0.000
6233.103
9136.265
d3
8355.657 755.0536
11.07
0.000
6871.184
9840.13
d4
4110.034 907.3007
4.53
0.000
2326.236
5893.832
d5
2267.724 1031.47
2.20
0.028
239.8027
4295.645
d6
6992.677 861.258
8.12
0.000
5299.401
8685.953
d7
2334.67 1147.134
2.04
0.043
79.34765
4589.993
d8
3689.056 1351.38
2.73
0.007
1032.175
6345.937
_cons
|
-3608.342 613.6416
-5.88
0.000
-4814.792
-2401.892
----------------------------------------------------------------------------------------------------------------------------------------------
. estat hettest
Breusch-Pagan / Cook-Weisberg test for heteroskedasticity
Ho: Constant variance
Variables: fitted values of Prod
chi2(1) = 204.56
Prob > chi2 = 0.0000
. reg Prod Agua d1 d3 d4 d5 d6 d7 d8, vce(robust)
Linear regression
Number of obs
= 400
F( 8, 391)
= 1 43.76
Prob > F
=
0.0000
R-squared
=
0.7197
Root MSE
=
4675.9
----------------------------------------------------------------------------------------------------------------------------------------------
Robust
Producto |
Coef.
Std. Err.
t
P>|t|
[95% Conf. Interval]
--------------- + -----------------------------------------------------------------------------------------------------------------------
Agua
1.471401 0721195
20.40
0.000
1.32961
1.613192
d1
7684.684
915.9814
8.39
0.000
6452.187
10259.13
d3
8355.657 968.1701
8.63
0.000
7423.162
11130.63
d4
4110.034 512.0528
8.03
0.000
3103.313
5116.755
d5
2267.724 529.8208
4.28
0.007
1226.07
3309.378
d6
6992.677 798.4113
8.76
0.000
5422.961
8562.394
d7
2334.67 866.2162
2.70
0.007
631.6462
4037.695
d8
3689.056 578.886
6.37
0.002
2550.938
4827.175
_cons
|
-3608.342 587.6699
-6.14
0.000
-4763.73
-2452.954
----------------------------------------------------------------------------------------------------------------------------------------------
