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Rarity calculations are similar to those used by many other rarity sites. If you're interested in the theory behind the rarity calculations, this article gives a very good overview.

Each PupLife NFT is ranked by:

• Assigning a score to each attribute based on the number of other PupLife NFTs with the same value for the attribute. The exact formula is:
  attribute score = number minted / number with same value
• Attributes with a value of "None" are scored based on the number of other NFTs that also do not have a value for the attribute, because sometimes not having a particular attribute could be rare!
• All attribute scores are summed to give a total score for the PupLife NFT.
• Customs are given a rank of 1. This is not based on the attributes they possess.
• The rest of the PupLife NFTs are ranked starting at rank 2 for the highest score (rarest) to lowest score (least rare).

The method used here to calculate a PupLife NFT's rarity based on individual attributes, while good, does have some shortcomings:

• At lower rarity levels, where the bulk of the PupLife NFTs sit, NFTs can be very different in rank despite having similar scores.
• As the combination of attributes possessed by a PupLife NFT aren't considered, the algorithm cannot determine the uniqueness or rarity of the NFT as a whole. If a particular combination of attributes is considered particular rare and valuable, this may not be reflected in the rarity ranking.
• All the PupLife NFTs look great and are distinctly different regardless of the rarity ranking, so take this with a pinch of salt.