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```{include} /../core/dataserver/statistics/correlation_matrix.md
``` 

Correlation matrices are computed in a 3 steps procedure detailed below:

- An overall $M$ matrix is created and filled, every line being a new entry while every column is a 
variable

- This matrix is centred and reduced: for every variable under consideration $\mu_{x}$ is subtracted 
and the results is divided by $\sigma_{x}$.

- The resulting correlation matrix is obtained from the product ${}^t \!M \times M$