![]() Big coefficients mean strong associations (positive or negative). A positive correlation means that an increase in one characteristic is associated with an increase in the other (and a decline in one is associated with a decline in the other). A negative correlation means an increase in one characteristic is associated with a decline in the other (and a decline is one associated with an increase in the other). Correlation coefficients range from -1 to 1. There are many ways to calculate association. Do parking lots with gate attendants, for example, have fewer thefts from vehicles than parking lots without gate attendants? Are apartment buildings with on-site managers at less risk of having drug dealing than ones without such managers? To answer questions like these you will need to determine if there is a statistical association between some characteristic of persons, places or events and some measure of the problem (crime, injury, etc.).
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