what is the difference between gdp-capita and environment why should i use gdp as an independent variable why is environment the most important variable in a sample why is gdp variable important to the environment which variable should be used for independent sample analysis in gdp per capita? what is the effect of environment on gdp what is a gdp per capita variable why use gdp variable instead of environment variable what is difference between environmental and gdp which of the following is a nominal variable that reflects the impact of gdp on the environment how many variables are in the gdp which is a nominal variable and which is a scale variable? which is more important environment or gdp what type of variable is the gdp per capita index? why does environment variable gdp have a variable is environment a scale variable what is gdp per capita what is the difference between an environment factor and gdp which is an important effect of gdp? why gdp has an important effect on environment