can you use panel regression to determine the relativeness of firm investment to gdp? how to evaluate the relationship of firm investment to gdp how to test the relationship of industry to investment? how many firm observations to run regression what measures are needed to test the relationship between a firm's investment in a country's gdp? how to test relationship between firm investment and GDP how to test the relation between firms' investment and gdp how to test the relation between firms' investment in gdp how to test the relationship between firms and gdp how to test the relationship between firm investment and gdp do you test each firm separately how to test investment to gdp how to test for the relationship between gdp and firm investment how do I test the relationship between firm investment and gdp how to test an individual firm's investment against GDP how to test if firm investment in a country increases what is the relationship between gdp and investment do we need to test the relationship of the investment level to the level of the gdp how many observations for each firm how to test the relationship of investment and GDP