Gap Minder Study
After looking through the codebook for the gap minder study, I have decided that I am particularly interested in the life expectancy of individuals per country and factors that affects it. I am not sure which variables I will use regarding this relationship so for now I will include all of the relevant variables in my personal codebook.
At this point, I would continue to explore the code book for the data set you have selected.
While CO2 emissions is a good starting point to investigate co-relationships, I need to determine what it is about life expectancy that I am interested in. It strikes me that people in different parts of the world live longer than others. In some countries, it is expected that when you reach age 50 you could die any time soon. I really want to understand why. There are certain factors that influences it. CO2 emissions could be one of them or maybe several other factors.
I decide that I am most interested in exploring the association between CO2 emissions and life expectancy. I add to my codebook variables reflecting life expectancy (e.g. CO2 Emissions, Alcohol consumption rate, suicide rate per 100,000 etc).