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Hi Mark,

You are right about the anomaly detection, it uses Holts Winters Multiplicative, Holts Winters Additive and Holts Trend Corrected algorithms. I am assuming you went through the whole documentation on anomaly detection and contribution analysis, if not here are the links to the same 

https://marketing.adobe.com/resources/help/en_US/reference/anomaly.html

https://marketing.adobe.com/resources/help/en_US/analytics/contribution/ca_concepts.html

It is difficult to reveal how Adobe applied this because that is something internal to the company but I would try to find out if there is a source to explain this in further detail for you. Feel free to ask further questions around this. Thanks!

Tanmay