Topics: Spearman's rank correlation coefficient, Non-parametric statistics, Incarceration Pages: 4 (589 words) Published: March 4, 2014
On the Correlation Between Crime and Punishment
In two previous posts (here and here) I've taken a look at the OECD's 50th anniversary present to all of us - their "Better Life Index" (BLI). One of the eleven components of that Index is titled "Safety" - and according to the OECD this component

"...... largely reflects the risks of people being physically assaulted or falling victim to other types of crime. Crime may lead to loss of life and property, as well as physical pain, post-traumatic stress and anxiety. The biggest impact of crime on people’s well-being appears to be through the feeling of vulnerability that it causes."

The BLI site also notes that

"Across the OECD, one person in six reported falling victim to a conventional crime, with physical assault accounting for nearly a quarter of all conventional crime. In terms of perceived safety, one out of four people in the OECD report feeling unsafe on the street after dark."

In addition, the average homicide rate across the OECD countries is 2.2 murders per 100,000 inhabitants.

An interesting question that arises is whether or not the relative safety level matches the relative incarceration rate.

The word "relative", here, is with respect to other OECD countries. Data for the incarceration rate (prisoners per 100,000 population) in different countries are gathered by the International Centre for Prison Studies in the United Kingdom, and are summarized on Wikipedia. The numbers for the OECD countries, together with those for the overall BLI (and its Safety component), are given below, and are also available in an Excel workbook on the Data page of this blog. Two versions of the full BLI are given - one that gives equal weighting to each of the 11 components, and one that uses "optimal" weights based on the Principal Components analysis in one of my earlier posts.

Incarceration BLI BLI BLI...
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