Thank you for your question Dr. Amiril Azizah, We use the data from the World Bank
which already classify countries based on their income level. 15 selected countries
are from lower and upper middle income categories, and all of them are developing
countries.
Thank you for your question Dr. Amiril Azizah, We use the data from the World Bank
which already classify countries based on their income level. 15 selected countries
are from lower and upper middle income categories, and all of them are developing
countries.