# HYBRIDTEST2

outlier gts

Since v1.0.0

Available on all platforms

##### See also

The `HYBRIDTEST2`

function detects outliers in a GTS (or a LIST of GTS) which has a seasonal part.

`HYBRIDTEST2`

is almost the same procedure than `HYBRIDTEST`

except that it does not use `STL`

decomposition for the
seasonal extract.

The seasonal part is approximated by pondering each value with the entropy of the modified Z-score of its seasonal subseries (series with only the values of the same season).

This test is usually preferred when it is meaningful to think in term of entropy, for example when the GTS represents counters of events. Also as it
does not use `STL`

decomposition, it is not prone to border effects, but at the cost of not detecting slight outliers.

This function only applies to `bucketized`

GTS of type **DOUBLE**.