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Getting started - Factors - z-score is redundant?

Hi all,

I am running the Factors part of the Getting Started guide. In it a 'momentum' factor is defined as a z-score.

I thought it was strange that all the values in the head are positive. To investigate I commented out the following line:

momentum_factor = momentum.zscore()

... and the head is unchanged. I suppose z-score is applied to rows but there is only 1 value per row?

Thanks!
Craig