(dataserver_statistics)=
# Statistical treatments and operations

This section presents the statistical computations allowed on the attributes in a {{tds}} through the 
following five main groups of method.

All the methods have been adapted to cope with the case of vector: a check is performed, allowing the 
computation to be done only if the number of element in the vector is constant (at least throughout 
the selection if one is requested). If the constant-size criterion is not fulfilled, the considered 
vector is disregarded for this method. The methods detailed here are:

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

```{toctree}
statistics/normalising_variable
statistics/computing_ranking
statistics/computing_elementary
statistics/quantile_computation
statistics/correlation_matrix
```