Relating the Murder Rate to Population and Income Disparity

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Murder rates are for 2006.
Income ratio=median city income/median state income. On the horizontal axis values above 1 indicate that the city's median income is higher than state's; a value of 1 means that they are equal, and values smaller than 1 occur if the city is poorer than the state as a whole.

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        The estimate of a linear relationship of decreasing murder rates to decreasing city-state income disparity comes from the regression of murder rate on population size and income ratio, and includes an interaction term to allow for different relationships within a specific population size. This data is not from a random selection. I picked the cities. So I make no claims of true relationships. Mostly, I just wanted to see if there were quantifiable measures available that could represent the intuition I have about Baltimore's unique status.
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