The attribution model that describes how to distribute credit for a particular conversion across potentially many prior interactions.
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 | Not specified. | 
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 | Used for return value only. Represents value unknown in this version. | 
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 | Uses external attribution. | 
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 | Attributes all credit for a conversion to its last click. | 
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 | Attributes all credit for a conversion to its first click using Google Search attribution. | 
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 | Attributes credit for a conversion equally across all of its clicks using Google Search attribution. | 
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 | Attributes exponentially more credit for a conversion to its more recent clicks using Google Search attribution (half-life is 1 week). | 
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 | Attributes 40% of the credit for a conversion to its first and last clicks. Remaining 20% is evenly distributed across all other clicks. This uses Google Search attribution. | 
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 | Flexible model that uses machine learning to determine the appropriate distribution of credit among clicks using Google Search attribution. |