Analyzing Potato Market Participation, Market Surplus, and Market Outlet Choice on Small Farm Household Level in Lemo District, Southern Ethiopia

Table 4

Results of the robust Heckman second-stage selection model for potato market surplus.

Variable	Coefficient	Stand error	Z
Age of household head	−.0420	.179	−0.23
Education level of household head	1.714	.534	3.21
Sex of household head	1.446	5.139	0.28
Member of cooperative	12.356	4.628	2.67
Distance to the nearest market	−.082	.055	−1.49
Adult equivalent	1.957	1.015	1.93
Effect of remittances	−3.890	3.565	−1.09
Total crop land size	13.667	13.667	3.56
Own transportation facilities	1.199	3.093	0.39
Oxen owned by a farmer (oxen)	13.821	3.735	3.70
Types of seed they used	8.514	3.237	2.63
Frequency of extension contact	1.439	1.507	0.96
Lagged market price	13.110	4.127	3.18
Constant	−61.998	−14.447	−4.29
Mills lambda (λ)	27.967	10.895	2.57
Rho	1
Sigma	19.804	1.931
Lambda	19.804	1.931

Note., , and show significance at 1, 5, and 10%, respectively.