Survival Analysis of Food Security in Asian Countries
This study focuses on using the survival analysis on food security application. The technique examines the effects of covariates on food insecurity among Asian countries in the period of 40 years since 1961. The analysis is carried out in order to determine the 'warning sign' of food in...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
2005
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/6357/1/FPSK%28M%29_2005_18.pdf |
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| Summary: | This study focuses on using the survival analysis on food security application. The
technique examines the effects of covariates on food insecurity among Asian
countries in the period of 40 years since 1961. The analysis is carried out in order to
determine the 'warning sign' of food insecurity condition. The data sources are
from FA0 and World Bank online database which include some particulars of 32
Asian countries.
It is observed that 21 of 32 (65.62%) countries experienced insecurity food
condition. The remaining are censored observations (34.38%). The stepwise Cox's
regression is used to select among the 24 independent covariates that are deemed to
be significant contribution to the model. Initial run of the SAS code finds that six
covariates are significant.
Based on the adopted model, at each time point, the West Asian region are found to
be more likely to have insecurity food condition compared to those countries in the
other regions. Furthermore, the occurrence of food security for East Asia countries
are more likely than for those in the other region. Meanwhile, it can also be seen
that countries in Lower-middle income group are more likely to reach insecurity
food condition than those in the other group. The analysis also shows that the high
income countries have high risk of exposure to insecurity food condition.
Since Cox regression analysis has the basic assumption of proportionality, the model
was tested whether it meets this condition. We use graphical method and formal test
of this assumption . In the presence of ties, the ties-handling method of Breslow,
Efron, Exact, and Discrete are compared with respect to Wald statistics, parameter
estimate, the hazard ratio, and p-value.
The availability of the determined dataset as in allows assessing categories of food
insecurity; Low, Medium, or High, which is useful to describe the nature of the food
insecurity conditions. Based on the analysis, we are able to find variables that play
important role on each stage of food insecurity condition of each country. |
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