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Technology, Gender and Food Security Interface: Cramers V & phi-test 1Source: Babu and Sanyal (2009)

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Presentation on theme: "Technology, Gender and Food Security Interface: Cramers V & phi-test 1Source: Babu and Sanyal (2009)"— Presentation transcript:

1 Technology, Gender and Food Security Interface: Cramers V & phi-test 1Source: Babu and Sanyal (2009)

2 Technology, Gender and Food Security Interface Gender empowerment: A major policy option considered for reducing income deprivation and food insecurity. Reasons: Women produce more than half the food grown in the developing countries. Women farmers in sub-Saharan Africa produce more than three-quarters of the regions basic food, manage about two-thirds of the marketing and at least one-half of the activities for storing food and raising animals. In Asia, women account for more than two-thirds of food production 2 Technology, Gender and Food Security Interface

3 Gender & its Importance Reasons: They contribute to about 45 per cent of production in Latin America and the Caribbean. Disadvantage: Women are risk-averse and hence, differential gender profile with respect to technology adoption or commercialization. Differential commercialization profile also; women prefer to grow food for home consumption; women have limited access to land labor, credit & extension services. 3 Technology, Gender and Food Security Interface

4 Differential gender profile of technology Implications: Differential distribution of gains of growth. Adverse implications for family welfare and nutrition. Resource allocation depends on womens share of resources (crop ownership) and household heads gender, education and age. Household characteristics, such as time spent in household activities by men and women, access to protected water and health and sanitation conditions impact on childrens nutritional status. 4 Technology, Gender and Food Security Interface

5 Issues 1.Gender profile of technology adoption 2. Gender profile of food security among technology adopters Empirical evidence has policy implications on food security Malawi: Male-headed households have a higher likelihood of adoption of hybrid maize than female- headed households after controlling for other important observable factors. Nigeria, Kenya, Ghana. 5 Technology, Gender and Food Security Interface

6 Empirical Verification Issues: – (i)Gender profile of technology adoption; – (ii) Gender profile of commercialization; – (iii) Implications for food security. 6 Technology, Gender and Food Security Interface

7 Empirical Verification Method: – cross-tabulation procedure ; pertains to relationship between two or more categorical variables: if male- or female-headed households are more likely to be technology adopters, whether the different households (male or female) are more food secure and finally we want to determine if male- or female-headed households are more likely to commercialize crops and thereby receive greater income from the proceeds. 7 Technology, Gender and Food Security Interface

8 Empirical Verification Variables: 1. HYBRID: Dummy variable; whether a household grows hybrid maize (HYBRID =1) or not (HYBRID = 0). 2. FEMHHH: Dummy variable; whether the household head is male (FEMHHH=0) or female (FEMHHH = 1). 3. CASHCROP: tobacco, groundnuts, cotton and plantain are the major cash crops in Malawi; Dummy variable for commercialization; CASHCROP = 1 if the household grows at least one of these four major cash crops and 0 otherwise. 4. CALREQ: Measure of food security ; if per adult equivalent calorie intake for households meets at least 80 per cent of the calorie requirement (2200 kcal); Dummy variable; CALREQ =1 if the household is food secure and CALREQ = 0 otherwise. 8 Technology, Gender and Food Security Interface

9 Table 4.1 Cross-tabulation results of technology adopters and gender of household head FEMHHH HYBRID FemaleMaleTotal No Yes Total =n 9 Technology, Gender and Food Security Interface

10 Table 4.2 Cross-tabulation results of food security and gender of household head FEMHHH CALREQ FemaleMaleTotal INSECURE SECURE Total =n 10 Technology, Gender and Food Security Interface

11 Statistical Test: phi coefficient 11 Technology, Gender and Food Security Interface

12 Phi coefficient (Ф) & Cramers V Chi-square test: test of association between categorical variables; it does not tell us the strength of the relationship. Phi coefficient and Cramers V: Quantify this relationship Based on the chi-square statistic that controls for the sample size. Designed for use with nominal data and with chi-square they jointly indicate the strength and the significance of a relationship. Limitation: Provide some sense of the strength of the association, they do not, in general, have an intuitive interpretation. 12 Technology, Gender and Food Security Interface

13 Phi coefficient (Ф) Ф coefficient: A measure of the degree of association between two binary variables. Ratio of the chi-square statistic to the total number of observations, i.e. Ф=χ 2 /N. Range: (-1, +1) for 2*2 tables. Sampling distribution is known; possible to compute its standard error and significance. SPSS and other major packages report the significance level of the computed phi value. 13 Technology, Gender and Food Security Interface

14 Phi coefficient (Ф) General rule of thumb for Ф coefficient of correlation is: -1.0 to 0.7 strong negative association -0.7 to -0.3 weak negative association -0.3 to +0.3 little or no association +0.3 to +0.7 weak positive association +0.7 to +1.0 strong positive association. It does not have a theoretical upper bound when either of the variables has more than two categories. 14 Technology, Gender and Food Security Interface

15 Cramers V Cramers V: Appropriate for tables that are larger than 2 *2 It is Ф rescaled so that it varies between 0 and 1. Cramers V is V= χ 2 /(N-1), where N is the total number of observations and k is the smaller of the number of rows and columns. For 2*2 tables, Cramers V is equal to the absolute value of the phi coefficient. This is because since k =2, the (k -1) term becomes Technology, Gender and Food Security Interface

16 Test: Gender & Technology adoption H 0 : No relationship between technology adoption and gender of the household head, i.e. incidences of hybrid maize adoption are not statistically different between the male- and female-headed households. 16 Technology, Gender and Food Security Interface

17 Table 4.3 Tests between technology adopters (HYBRID) and gender of household head (FEMHHH) Valuep value Phi Cramers V Number of valid cases Technology, Gender and Food Security Interface

18 Test: Gender & Technology adoption (p value), the null hypothesis is rejected at the 1 per cent level of significance. Inference: incidences of hybrid maize adoption are statistically different between the male- and female-headed households. Although the value of the phi coefficient is low (0.117), it is statistically significant at the 1 per cent level. 18 Technology, Gender and Food Security Interface

19 Test: Gender & Food Security H 0 : No relationship between food security and gender of the household head for hybrid maize growers, i.e. both male- and female-headed households are not statistically different with regard to food security. 19 Technology, Gender and Food Security Interface

20 Table 4.4 Tests between food security (CALREQ) and gender of household head (FEMHHH) Value p value Phi Cramers V Number of valid cases Technology, Gender and Food Security Interface

21 Test: Gender & Food Security Significance level ( Cramers V & phi statistic) > 0.01 =>, the null hypothesis cannot be rejected even at the 10 per cent level. Inference: For both groups of households (male- and female-headed), incidences of food security are not statistically different among hybrid maize growers; no pattern of relationship between gender of the household head & food security for the technology adopters for this sample. 21 Technology, Gender and Food Security Interface

22 Gender & Commercialization H 0 : No relationship exists between cash crop growing and gender of the household head, i.e. incidences of cash crop commercialization or adoption are not statistically different between male- and female-headed households. 22 Technology, Gender and Food Security Interface

23 Table 4.5 Tests between cash crop commercialization (CASHCROP) and gender of household head (FEMHHH) Value p value Phi Cramers V Number of valid cases Technology, Gender and Food Security Interface

24 Gender & Commercialization Significance level (Cramers V & phi statistic) = 0.017, the null hypothesis can be rejected at the 5 per cent level. Incidences of cash crop commercialization are statistically different for both the groups of households (male- and female-headed). Inference: Incidence of cash crop commercialization is statistically different between male- and female- headed households. Although the value of the phi coefficient is low (0.097), it is statistically significant at the 5 per cent level. 24 Technology, Gender and Food Security Interface


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