Numista Swap Index

Include a new index(at right of current Numista Rarity Index) to know how many times this coin has been swapped last month/last year/all time.

It would give us an idea
- how hard is to get this coin in the swap e.g. this coin was never swapped https://en.numista.com/catalogue/pieces14302.html so probably if you want it , you must go shoppping.

- how fashion is the coin. e.g. if this coin https://en.numista.com/catalogue/pieces103409.html is top swap and if there are not members with it, probably new ones will appear soon.

- other factor to balance the swaps, for same "rarity index" the "swap index" could decide if the coin is really easy or hard to get.

This index could be included in "search functionality" too.

I love statistics so it certainly isn't a bad idea in itself.
But:

QuoteJapoivvb
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​It would give us an idea
​- how hard is to get this coin in the swap e.g. this coin was never swapped https://en.numista.com/catalogue/pieces14302.html so probably if you want it , you must go shopping.

A much easier and more accurate way is to just look at the coin page and see how many times a specific coin is offered in swap lists. That tells you much more than a number. Besides, to see that number you already have to go to the coin page so you can immediately see who has the coin you're looking for in his swap list. And then you can also see which dates are available for swapping while the number only gives an indication about the type of the coin, not about the dates.
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QuoteJapoivvb
​​It would give us an idea
​- other factor to balance the swaps, for same "rarity index" the "swap index" could decide if the coin is really easy or hard to get.

The "swap index" doesn't mean anything for this matter. The most common coins will have a very high "swap index" (assuming like the "rarity index" a high number means little swaps and a low number means many swaps) because (almost) everybody will have these kind of coins. But that high swap index" indicates it's a hard to get coin while it's just the opposite.
Because a high "swap index" can mean both very hard and very easy to get, the "swap index" can't serve as a factor to balance a swap.
Besides there are too many factors influencing the "swap index": coins from certain countries are much more sought after than other countries, so these coins will have a lower "swap index" which means they are easier to get, but because everyone is looking for these coins they are harder to get.

My opinion: the "swap index" can be an interesting statistic feature, but nothing more than that, that number hasn't any reliability for other purposes.
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Also a nice one would be showing how many swappers added the coin to their exchange list in the past week/month.

Fun fact: Here are the top 8 most swapped coins, with more than 1500 confirmed swaps each.

1. France - 2 Euro (Speech of June 18th 1940) - 2010 (1985 swaps)
   
2. Italy - 2 Euro (Torino Olympics) - 2006 (1692 swaps)
   
3. France - 2 Euro (Élysée Treaty) - 2013 (1665 swaps)
   
4. France - 2 Euro (French Presidency of the EU) - 2008
   
5. France - 2 Euro (Music Day) - 2011
   
6. UK - 1 Pound - Elizabeth II (2nd portrait; Royal Arms) - 1983
   
7. France - 2 Euro (10 Years of Euro Cash) - 2012
   
8. France - 2 Euro (EURO 2016 Football Championship) - 2016
   

It looks like French people need to get rid of their 2 euro coins

In a context of exchanges or sales, they are provided on request
We can question the motivations
Can their destination provide a clue