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Market data bug or not?
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Angry Wife Agro
Imperial Academy
Amarr Empire
#1 - 2013-11-23 03:29:51 UTC
Hi,

When trading and analizing market data i noticed mismatch in item price data values. Here is an example:

http://i.imgur.com/agTwO6K.png

2013.10.25 bought item for 1,344 bil, but price history shows lowest price for that day is 1,75 bil.

So, is this a bug or am I missing something? If this is a bug, how traders can trust given information when analizing and trading in market? Is it correct to guess that there might be more incorect market data for various items?

I apreciate informative replies, thanks :)
Molic Blackbird
Orion Faction Industries
Orion Consortium
#2 - 2013-11-23 03:39:16 UTC
The price history has filters applied to the data. The parameters for what data gets filtered out is not known. The historical data isn't 100% accurate, but close enough.
Drab Cane
Carbenadium Industries
#3 - 2013-11-23 03:46:15 UTC
As Molic stated, some trades are removed from the price history. Either because they are too low, or too high (outliers). CCP has a secret formula that determines whether a trade is an outlier or not.
Angry Wife Agro
Imperial Academy
Amarr Empire
#4 - 2013-11-23 04:20:43 UTC  |  Edited by: Angry Wife Agro
I see. So basically, they "repair" price "spikes" like in this example:

http://i.imgur.com/dDSdqUe.png

But it also makes me wonder, why this one for example looks not "repaired":

http://i.imgur.com/iPB8a7d.png

Price values for Genolution 'Auroral' 197-variant arent that much different 1,34 bil and 1,75 bil, but price for Drone Transceiver jumps like 6 times above avarage price.

EDIT: My guess is that large quantities of Drone Transcievers were bought at 2013.01.22 at very high prices, thats why it wasn't changed. They "remove" only small quantities of items bought at very different prices.
Drab Cane
Carbenadium Industries
#5 - 2013-11-23 08:25:53 UTC
Yes, the 'weight' of a potential outlier seems to be a factor.

I believe the idea is to keep traders from manipulating the chart with small, 'crazy' orders, while still trying to recognize 'real' orders.
Donbe Scurred
University of Caille
Gallente Federation
#6 - 2013-11-26 00:49:16 UTC
Angry Wife Agro wrote:
analizing


Sounds painful for all parties, maybe you should try analyzingLol