Table 2.

Variable name, description and summary statistics.

Variable	Definition	Mean	SD
Dependent variable
Adoption	Adoption of improved cowpea varieties (1 = adoption)	0.67	0.47
Yield	Cowpea yield (kg/ha)	2118.65	1488.93
Crop Income	Cowpea income (GHS)	1486.31	1227.99
Treatment variable
Training	Participated in cowpea training (1 = yes)	0.34	0.47
Explanatory variables
Age	Age of household head (number of years)	43.68	12.40
Sex	Sex of household head (1 = male)	0.59	0.49
Education	Number of years of formal education	6.98	4.68
Size	Household size	9.38	4.51
Experience	Years of farming experience	20.19	11.80
Cooperative	Member of cooperative (1 = yes)	0.19	0.39
FBO	Member of a farmer-based organization (1 = yes)	0.53	0.50
VSLA	Member of a village savings and loan association (1 = yes)	0.46	0.50
Cowpea area	Area under cowpea (hectares)	1.18	0.76
Member of Parliament	Access to Member of Parliament or politician (1 = yes)	0.25	0.43
Extension	Distance to nearest extension service (km)	3.85	7.85
District level controls
Tolon district	Household is located in Tolon district (1 = yes)	0.15	0.36
Savelugu district	Household is located in Savelugu district (1 = yes)	0.18	0.38
Yendi district	Household is located in Yendi district (1 = yes)	0.18	0.38
Bawku Municipal	Household is located in Bawku district (1 = yes)	0.09	0.29
Binduri district	Household is located in Binduri district (1 = yes)	0.16	0.37
Wa West	Household is located in Wa West district (1 = yes)	0.13	0.33
Nadowli district	Household is located in Nadowli district (1 = yes)	0.13	0.33

Note: Exchange rate: US$1 = GHS5.37 (Bank of Ghana, 2019).