Apply transform conditioning on laged values

General Usage
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Hi there,

I am trying to add a column in my DataFrame by using the function transform. I need to groupby a couple of categories and then calculate add a new column based on the lagged values of each row. The reason why I need to groupby is that I do not want to take as lagged values observations from other groups and therefore I need the transformation to be within groups.

However, I do not seem to find how transform allows for this.

Thanks a lot,
Miguel.

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