Table 4.
Logistic regression results for farmers sourcing sweetpotato vines from their own farms or elsewhere
| Independent variables | Description of the variables | Model capturing all households | ||
|---|---|---|---|---|
| b | eb | |||
| I. Individual characteristics | ||||
| Age | Age of the person who is knowledgeable about sweetpotatoes (years) | 0.081! | 1.084 | |
| Age squared | Farmers’ age squared | −0.001! | 0.999 | |
| Education | Number of school years attended by the respondent | 0.01 | 1.01 | |
| Education squared | Farmers’ education squared | −0.002 | 0.998 | |
| Sex | Dummy variables for male (1) and female the reference group (0) | 0.055 | 1.057 | |
| Training in sweetpotato production and management | Dummy variables for farmers who have received the training (1), and farmers who have not been trained serve as a reference group (0). | 0.587! | 1.798 | |
| Knowledge of sweetpotato diseases | With values 0 to 1.0 if all questions are answered incorrectly, 0.2 if one question answered correctly, 0.4 if two questions answered correctly, 0.60 if 3 questions answered correctly, 0.80 if 4 questions answered correctly and 1 if 5 questions answered correctly | 0.598! | 1.818 | |
| Agriculture as principal or secondary activity | Dummy variables for the categories principal activity (1) and secondary activity (2) | −2.006** | 0.135 | |
| II. Household characteristics | ||||
| Household size | Number of people living in the household (meaning sharing the same kitchen), children and adults of all ages | 0.02 | 1.02 | |
| Total land owned in the 2008/2009 cropping seasons (acres) | The size of the land that the farmer owns in the 2008/2009 cropping season in acres. For missing values, the average of the district’s land holding was used to fill in the gap. This is a continuous real variable. | 0.012 | 1.012 | |
| Number of plots for which the woman of the household has control over what is grown | The number of plots of land owned by the woman of the household. For missing values, the average of the district’s land holding was used to fill in the gap. This is a continuous real variable. | 0.151* | 1.162 | |
| Access to or ownership of land at the bottom of a valley | Dummy variables for owning or having access to valley bottom (1) and farmers who do not own or do not have access to a valley bottom (0) | 0.145 | 1.156 | |
| Selling sweetpotato vines | Dummy variables for selling sweetpotato vines: if yes (1), if no (0) | −0.209 | 0.812 | |
| Selling sweetpotato storage roots | Dummy variables for selling sweetpotato storage roots: if yes (1), if no (0) | 0.764*** | 2.147 | |
| Farmer satisfaction with the quality of planting material present on her/his farm | Refers to farmers’ satisfaction with the quality of vines that are usually available at the time of planting. With categories: 1 if satisfied, 2 if somewhat satisfied and/or not satisfied | −0.22 | 0.803 | |
| Household membership in a crop production association | Dummy variables for any member of the household actively participating in any savings, credit, women or farmer association: if yes (1), if no (0) | 0.193 | 1.213 | |
| III. Community-level characteristics | ||||
| Wet area | Area near the lake. Dummy variables 1 for wet area and 0 otherwise | 0.389 | 1.475 | |
| Village road type | The type or road that provides the main access to this village. Dummy variables 1 for foot paths and/or for secondary earth road; 2 for primary earth or murram road and/or for tarmac road; and 3 for water transport. | −0.758*** | 0.469 | |
| Distance to the nearest outlet markets (km) | The distance to the nearest outlet/market to buy seed or fertilizer. This is a real continuous variable represented in km. | 0.006 | 1.006 | |
| Constant | −0.626 | |||
| Number of sample size (N) | 621 | |||
| −2 Log Likelihood | 73.95 | |||
| Model Chi-square | 0 | |||
| Pseudo R2 | 0.0869 | |||
! p < 0.10;*p < 0.05;**p < 0.01;***p < 0.001 and eb = odds ratio