Table 5 Estimated beta coefficients and standard errors for the outcome equations estimated
by polynomial, nonparametric I and nonparametric II methods
|
Variablea |
Polynomial Methodb____________ |
Nonparametric Method Ic___________ |
Nonparametric | |||
|
Coefficient |
S. Err or |
Coefficient |
S.Error |
Coefficient |
S.Error | |
|
Constant |
1.79182 |
0.02072 |
---- |
---- |
--- |
--- |
|
Age |
-0.00115 |
0.00117 |
-0.00104 |
0.00118 |
-0.00115 |
0.00117 |
|
Age sq. |
0.00001 |
0.00002 |
0.00001 |
0.00002 |
0.00001 |
0.00002 |
|
Farm work last year |
0.00192 |
0.00072 |
0.00180 |
0.00074 |
0.00192 |
0.00072 |
|
Experience |
0.01189 |
0.00186 |
0.01282 |
0.00189 |
0.01189 |
0.00186 |
|
Experience sq |
-0.00059 |
0.00010 |
-0.00065 |
0.00010 |
-0.00059 |
0.00010 |
|
English |
-0.00392 |
0.00530 |
-0.00418 |
0.00533 |
-0.00392 |
0.00530 |
|
Female |
-0.03970 |
0.00842 |
-0.03997 |
0.00827 |
-0.03970 |
0.00842 |
|
Piece rate |
0.17784 |
0.00901 |
0.17786 |
0.00900 |
0.17784 |
0.00901 |
|
Grower |
0.04105 |
0.00633 |
0.04085 |
0.00632 |
0.04105 |
0.00633 |
|
Seasonal worker |
0.00011 |
0.00498 |
0.00033 |
0.00499 |
0.00011 |
0.00498 |
|
Education |
0.00600 |
0.00084 |
0.00597 |
0.00084 |
0.00600 |
0.00084 |
|
Foreign farm work |
0.00620 |
0.00535 |
0.00630 |
0.00536 |
0.00620 |
0.00535 |
|
After 2001 |
0.06019 |
0.00683 |
0.05984 |
0.00650 |
0.06019 |
0.00683 |
|
California |
0.04973 |
0.00376 |
0.04965 |
0.00376 |
0.04973 |
0.00376 |
|
Age*pscore |
0.01188 |
0.00285 |
0.01167 |
0.00286 |
0.01188 |
0.00285 |
|
Age sq*pscore |
-0.00016 |
0.00003 |
-0.00016 |
0.00003 |
-0.00016 |
0.00003 |
|
year*pscore |
0.00521 |
0.00164 |
0.00532 |
0.00168 |
0.00521 |
0.00164 |
|
Experience*pscore |
-0.00584 |
0.00251 |
-0.00652 |
0.00242 |
-0.00584 |
0.00251 |
|
Experience sq*pscore |
0.00047 |
0.00010 |
0.00054 |
0.00010 |
0.00047 |
0.00010 |
|
English*pscore |
0.03746 |
0.00746 |
0.03962 |
0.00745 |
0.03746 |
0.00746 |
|
Female*pscore |
-0.03008 |
0.01768 |
-0.02901 |
0.01753 |
-0.03008 |
0.01768 |
|
Piece rate*pscore |
0.04276 |
0.01960 |
0.04278 |
0.01953 |
0.04276 |
0.01960 |
|
Grower*pscore |
0.04555 |
0.01480 |
0.04666 |
0.01475 |
0.04555 |
0.01480 |
|
Worker*pscore |
-0.04703 |
0.01385 |
-0.04818 |
0.01388 |
-0.04703 |
0.01385 |
|
Education*pscore Foreign farm work |
-0.00254 |
0.00172 |
-0.00241 |
0.00174 |
-0.00254 |
0.00172 |
|
Experience*pscore |
0.00837 |
0.01151 |
0.00740 |
0.01152 |
0.00837 |
0.01151 |
|
After 2001*pscore |
0.06955 |
0.01541 |
0.07020 |
0.01507 |
0.06955 |
0.01541 |
|
California*pscore |
-0.01112 |
0.00848 |
-0.01116 |
0.00844 |
-0.01112 |
0.00848 |
|
Pscore |
-0.15046 |
0.10896 |
---- |
---- |
--- |
--- |
|
Pscore2 |
0.73697 |
0.44991 |
---- |
---- |
--- |
--- |
|
Pscore3 |
-2.20958 |
0.61096 |
---- |
---- |
--- |
--- |
|
Pscore4_______________ |
1.47909 |
0.28288 |
---- |
---- |
--- |
--- |
a’Pscore’ denotes the propensity score, which is the probability of becoming legalized. bThe outcome equation is
estimated as a polynomial in the propensity score (Heckman, Urzua and Vytlacil, 2006). cThis is the LIV estimator
from Heckman and Vytlacil (2001, 2005). dThis method combines the nonparametric I and the polynomial
approach.
25
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