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Price History Anomaly
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Noriko Mai
#1 - 2013-11-16 20:09:19 UTC
The price history for COGs showed 400+ traded with 70M max a hour or two ago. Now it is back to ~200 from early evening. How and why did that happen? Does this happen often?

Thanks in advance.

"Meh.." - Albert Einstein
Samroski
Middle-Earth
#2 - 2013-11-17 08:14:18 UTC
I'm confused.

(a) "COG" is probably a well known abbreviation, which I cannot seem to recall...
(b) so you can see that 400 units of COG were traded "with" 70M???
(c) and now COG is back to 200??? 200 million or units or what?

Maybe I need to be intoxicated.... should never play Eve/read forums when sober...

Any colour you like.
voetius
Grundrisse
#3 - 2013-11-17 08:48:27 UTC
That had me scratching my head for a sec as well.

I assume it's Customs Office Gantry (I've been watching them as well), the price is in the right ballpark.

"with" 70M in this context "with a maximum price of 70M"

I've seen some odditities in the market history table but it is usually where the volume is zero when you know that this is incorrect. I've seen it on plex a few times as well as other items, possibly just high volume items, I'll try and remember to keep a note in future. But I've never seen the volume figure go down - one to watch for I guess.
Noriko Mai
#4 - 2013-11-17 15:50:14 UTC
It was back to 200 traded. But a few hours after my post it seems that it was recalculated again and shows now the correct number of trades with the correct price min/max. Seems to be just a small hickup from the server. I've seen the zero trades thing a few times before, too. But I have never seen it go down.

"Meh.." - Albert Einstein
Diomedes Calypso
Aetolian Armada
#5 - 2013-11-17 22:20:56 UTC  |  Edited by: Diomedes Calypso
I've found the market data regarding low high and average price to be highly inaccurate .

Working as intended I believe. They use some arcane formula to throw out "outliers" I'm not sure if the transactions elminated are based on a standard deviation limit from a multi day average price but I think they are.

Still.. even that is not entirely correct. Sometimes you will see an item with the extra three digit error (see market blunders thread) in the "high price" and but usually you will not.... and clearly those sold for 1000 times the normal price are "outliers".

I also think that "average price" is closer to a "median price" .. although it might be the simple average between the Median price and the Average price... which at times makes them one and the same.


All of that is good for me. I routinely sell items over the listed "high price" of a day for a region.

.
Thoraemond
Far Ranger
#6 - 2013-11-17 22:45:50 UTC
Diomedes Calypso wrote:
I also think that "average price" is closer to a "median price" .. although it might be the simple average between the Median price and the Average price... which at times makes them one and the same.

Also, "average" is quite vague as a term. It's often used as a catch-all term for measurements of central tendency, and is often used interchangeably (if imprecisely) with simple mean. However, "average" could also refer to other concepts, like (a) geometric mean, (b) median, (c) mode...

Historically in EVE, players gathered evidence that the values labelled "median" in the in-game Market History charts and tables were in fact not medians, but were simple means. Since "average" could refer to "mean" or "median", the column in the market history table is correct either way, if pretty vague. That research might be obsolete, though, as it was a few years ago.

As far as I know, CCP has never provided the definition of "outlier" in the market history data, nor have any players determined precisely what the method is. (If I'm wrong about that, I'd appreciate someone pointing me to that.)

There may also be some difference between how "intraday" and "past days" data are reported on the market history charts and tables, even though they are under the same labels. Since the calendar day ticks over at a different point than down-time, there may also be some effect of some market history figures being recalculated at down-time that has an impact on this system, too.

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Jdestars
Stars Research systems Incorporation
#7 - 2013-11-19 11:25:10 UTC
some ops before the annual Patch but not sure that a good idea with this item

Item was release on marketin singularity in some station not like other 100 isk item so , if CCP introducte them in market with npc order ... some crying lost in space this afternoon
Noriko Mai
#8 - 2013-11-19 12:29:01 UTC
Jdestars wrote:
some ops before the annual Patch but not sure that a good idea with this item

Item was release on marketin singularity in some station not like other 100 isk item so , if CCP introducte them in market with npc order ... some crying lost in space this afternoon

What????

"Meh.." - Albert Einstein