**A correlogram **or **correlation matrix** allows to analyse the relationship between each pair of numerical variables of a matrix. The **correlation** between each pair of variable is visualise through a scatterplot, or a symbol that

represents the correlation (bubble, line, number..). The diagonal represents the **distribution** of each variable, using an histogram or a density plot. This technique is widely used for **exploratory analysis** since it avoids to make

hundreds of plots to observe a matrix.

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**Correlogram**

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