How to ensemble average with periodic inputs using System ID toolbox?

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I am using the System Identification Toolbox. In general, one advantage of using periodic input signals, such as PRBS, is the possibility of ensemble averaging multiple periods of data to reduce noise.
I can not find any reference for how this might be done within the System Identification Toolbox. I see that when importing data sets into the app it is possible to assign a period, but I don't know how or if this value is used. As far as I can tell it doesn't provide any ensemble averaging, but perhaps it is done internally when performing the estimation.
I can of course do the ensemble averaging myself outside of the toolbox, but this seems awkward, and I'm thinking that there is a way to do it within the toolbox but I just haven't discovered it.
If anyone can please let me know how to do the ensemble averaging within the System ID toolbox, or let me know that it definitely is not possible I would appreciate it.

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