Exclude extremely high values in the numista group source valuation

I have noticed that on some French coins(5,10,20 centimes), the value for the “UNC” coins is way higher than it should be. I believe the reason for this is someone sets an extremely high buying value for it ($999,999 or something). This then skews it to be way higher than it should be. Maybe values less than 25% or greater than 400% of the current average should be excluded to be more accurate? If the algorithm already does this, can someone explain why the price is so high for these coins? Just a thought. -Lucas

There are threads (by Xavier) explaining how these values are calculated but it's not based on the mean/average of all values but the median (midpoint) of all values.  A very high or very low value would not affect the medium.

Hello,
I confirm that the values are calculated based on median values. So there is no difference if someone enters a buying value that is 20% higher than the market price or 20 times higher than the market price.

I can give more details for the specific coins you mentioned if you give a link to those coins.

I see, thanks. The main ones that seem inflated are these.

N#2

N#3

N#4

Any reason why a common date is $3-4? these are extremely common and Krause lists them under 50 cents. Some are up to $10 for a common date!

I looked at the N#2 year 1982 for example.

Here are the user values (in EUR) for the grade UNC, from oldest to most recent:

3, 0.20, 7, 0.03, 4, 0.80, 3, 60, 7,  0.25,  0.10, 7, 6, 3.50, 3, 15.50, 3.50, 3.50, 2, 3.50.

The price also considers one eBay realized sale with price 1.50 EUR.

You can see that the most common buying value (especially for recent acquisitions) is 3.50 EUR.

Looking at eBay, you can get one specimen from the “fleur de coin” set for 2 EUR + shipping (4.75 EUR), so 3.50 EUR may indeed be overpriced, but still cheaper than eBay if you factor in the shipping price. Some people are ready to pay more to get the best grade.

Generally speaking (not specifically low value modern franc coins), prices of coins in UNC grade can vary a lot. You can have huge variations between a MS60 and a MS68.