You just graduated college and are looking to move to the place where you will meet the person of your dreams! So instead of researching places that will offer you a steady source of income, you collect population data from various cities, regions, and states. You want to make sure that you move to a place where you can meet a lot of men or women within 5 years of your age, but you don't want to feel limited by one city.
You've decided you will only move to a place where there are a lot of potential spouses within a region or network of cities near yours. (After all, you are a smart college graduate!)
According to this description, your analysis relies on which factor(s)?