Table 5 Conventional and selection SPF based on matched observations

cons

4.407***

1.173

5.011***

0.000

3.459**

1.753

3.30277***

0.41786

4.59917***

1.44511

Value_fertilizer

0.003***

0.001

0.003***

0.000

0.003***

0.001

.00466***

0.00033

.00391***

0.00058

Value_seed

0.839***

0.275

0.579***

0.000

1.092***

0.414

1.00655***

0.09091

.78095**

0.33539

Value_labor

0.002

0.023

0.076***

0.000

−0.020

0.028

.05404***

0.01047

0.01089

0.02271

Land_maize

0.131

0.273

0.315***

0.000

−0.104

0.411

−0.08678

0.09178

0.17441

0.34022

Off_farm

0.002

0.015

.00169

.015266

Sigma

.29978***

0.001

0.033***

0.005

0.105***

0.010

Sigma(u)

.18861***

0.0029

.35989***

0.0098

Sigma(v)

.00973**

0.00449

.04921***

0.0093

Rho(w,v)

.76645**

0.39002

.89504***

0.33496