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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 Playtatoe is ranked by:

• Assigning a score to each attribute based on the number of other Playtatoes 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 Playtatoes 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 Playtatoe.
• The Playtatoes are ranked starting at rank 1 for the highest score (rarest) to lowest score (least rare).

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

• Very rare attributes contribute significantly to the score. This could result in large changes in ranking in the earlier days of the project when some attributes are rare, but may not be as rare as more NFTs are minted.
• For the more common items with higher ranks, where the bulk of the Playtatoes sit, NFTs can be very different in rank despite having similar scores.
• As the combination of attributes possessed by a Playtatoe 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.