Correlation Coefficient - Statistics
Correlation. Correlation is a statistical technique that can show whether and how strongly pairs of variables are related. For example, height and weight are related; taller people tend to be heavier than shorter people. The relationship isn't perfect.
A simple way to have a better understanding of it, correlation is the result of the experiences between variables to justify the causes.
The main result of a correlation is called the correlation coefficient (or "r"). It ranges from -1.0 to +1.0. The closer r is to +1 or -1, the more closely the two variables are related.
Solução da violência urbana: reduzir número de padeiros! (The solution is for urban violence: reduce the number of bakers!)
Source (in Portuguese): https://www.escolaedti.com.br/planejamento-de-experimentos-entendendo-correlacao-e-causa/
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