How does the Kalao rarity ranking method work
Have you ever wondered how rare an NFT is before you buy it? I'm sure you have. To help you assess this value more easily, we have set up direct access to this rarity calculation on the Kalao marketplace. This article will detail how this value is calculated.
1. Take a look at the attributes, also called "properties". If you look at any collectible NFT item on Kalao, such as NFT#5409 in Crypto Dickheads collection, you will see that it has many properties (or traits):
Simply by looking at the different properties, you will be able to notice if some of them contain rare traits or not.
Since an NFT regularly contains many of them, in order to compare it to the other NFTs in its collection, it is necessary to combine all these characteristics into a value that we will call the rarity score in order to classify it.
2. Calculation of the rarity score: The method consists in calculating the rarity score of each characteristic and then adding the sum of each characteristic to have a rarity score taking into account all the characteristics of the NFTs.
[Rarity Score for a Trait Value] = 1 / ([Number of Items with that Trait Value] / [Total Number of Items in Collection])
Because [Number of Items with that Trait Value] / [Total Number of Items in Collection] is the same as the trait rarity (fractional, not %), we can also say that :
[Rarity Score for a Trait Value] = 1 / [Trait Rarity of that Trait Value]
Now you just have to do this calculation for all the traits of the NFTs and then add the sum of the traits of the rarity score to get the global rarity score of the NFT.
You will be able to find the rarity score of each NFTs directly in the collection page linked to this NFT, and will have the possibility to sort them by ascending order:
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