According to the United States Census Bureau, the town has a total area of 2.5 square miles (6.4 kmÂ²), of which, 2.4 square miles (6.3 kmÂ²) of it is land and 0.04 square miles (0.1 kmÂ²) of it (1.21%) is water.
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I would take the first option. Each record that is considered a duplicate is a duplication event. Each such event would seem to be the relevant number. In terms of process control, each record entered is an opportunity for defect. Each duplication is a defect.. Defects Per Opportunity (or DPMO) being your measure. It's important to note that in your example, however, only 3 of the 4 records would be a defect.