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Table 6 Covariates used to estimate PS using the bivariate Probit Model

From: Impact of supply chain coordination on honey farmers’ income in Tigray, Northern Ethiopia

Covariates

Contract

Cooperative

Coef.

Std. err.

Coef.

Std. err.

Age, HH head

-0.03 c

0.01

0.00

0.01

Illiterate, HH head

-0.22

0.21

0.05

0.22

Household size

0.06

0.06

-0.13 c

0.05

Active family

-0.00

0.13

0.15

0.12

Production experience

0.02

0.02

0.00

0.02

Land size

1.19 b

0.56

-0.28

0.44

Land size2

-0.56 b

0.28

0.09

0.18

Tropical Livestock unit (recall 5 years ago)

0.01

0.01

0.02 a

0.01

No. of modern hive (recall 5 years ago)

0.05

0.03

-0.01

0.05

No. traditional hive (recall 5 years ago)

-0.03

0.02

0.03 a

0.01

Distance to Mekelle

0.00

0.00

-0.01

0.01

Distance to asphalt road

0.02 c

0.00

0.02 c

0.01

Distance to RDO

0.03

0.02

0.01

0.02

Constant

-1.88 c

0.53

-1.17 b

0.49

Number of observations

393

 

Wald chi2(26) =

504.32 c

 

Wald test of rho = 0

chi2(1) = 35.77 Prob > chi2 = 0.00

  1. a . b , c significance at 10, 5 and 1% significance level