Pamela Oliver
There is a lot of confusion in understanding imprisonment data created by the failure to understand the difference between the characteristics of people sitting in prison at any one time (what are technically called the “stock”) and the characteristics of the people who have gone though prison (the flow). This
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It is important to understand how long people stay in prison as part of understanding revocations. The graph below shows how long people stay in prison across all admission types. The vertical axis shows the cumulative percentage who have exited after the number of months on the horizontal axis. So,
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