laklak wrote:I must admit, I'm not quite getting the graph either. It appears that when approximately 5% of households own guns there are either 2.3 murders per 100,000, or about 7/100,000. At 40% ownership we get everything from just over 1/100,000 to nearly 10/100,000. If we take all guns out of circulation there are no murders, period. Nor are there at ownership rates in excess of about 60%.
If this data is correct it appears that gun ownership has absolutely nothing to do with murder rates.
There is no constant ratio between gun ownership and homicide rates from state to state. There are just too many complicating factors involved for that, such as the urbanisation rate, average income levels, and whatnot others of one state compared to another. Unsurprisingly you may find two states with very similar levels of gun ownership sporting quite different homicide rates. For example, Michigan (28.8 & 5.8), Vermont (28.8 & 1.6).
Altogether, a trend is not readily discernible by eye. That makes it easy to "prove" anything you want to via some judicious cherry picking. If you use the data of all states, however, cherry picking is no longer possible, and that is what I did. The y-axis measures the percentage of households (which should explain to you why the scale doesn't go much beyond 60%) of
all states, and the x-axis measures murders/100,000 of the population of
all states. Since we're dealing with percentages and per population, the differences in population between states is irrelevant. I then let the spreadsheet's algorithm work out a trend. It came up with a slight upwards gradient - despite the sawtooth pattern of gun ownership the trend is an increase of murder rates accompanying an increasing percentage in gun ownership per household.
I can assure you that I did not massage the data in any way. All states are there and the two relevant columns (gun ownership per household and murder rate per 100,000) were a pure copy-paste job. As for the trend line itself, that's just a matter of clicking a button. You can replicate what I have done yourself if you could be bothered. I provided links to the data and described the way I entered them in the spreadsheet. You could even resort the columns, grading by gun ownership instead of murder rates on the x-axis. In that case the same trend could be seen, just differently. Instead of gun ownership, the sawtoothed line would represent murder rates, but the trend would still be a gradient indicating the same relationship.
Had that line turned out to be horizontal, I would have argued that there is no correlation between gun ownership rates and murder rates. Had that line turned out to be dropping, I would have argued that John Lott was right: More guns, less crime.