The abbreviated guide to EVE-Central statistics
This question comes up every now and then, for the clued in folks who try to determine how the pricing aggregates (median, average) are produced, especially when they notice it vary across the site. This quick guide is designed to settle some of these questions, which undoubtedly will lead to more questions.
The Basics
- All aggregate pricing information has a deadband filter to remove the 0.01 ISK noise. This filter varies by type ID, but generally cuts off at >= 1.0 ISK.
- The average is the weighted average. The weight is simply the amount offered for sale or purchase.
- The median is as advertised. It represents the median order, regardless of the quantity offered.
Exceptions
- The statistics are governed by minimum quantities, which vary according to the type ID and view if not specified by the user.
- Specifically, if using the marketstat API, the minimum quantity for all mineral types (including Morphite) is set to 10,000. This minimum quantity is not used in the quicklook API or when viewing on the web.
- The evemon API uses a minimum quantity of 5,000 (not sure why…) and is the aggregate price for the set of buy and sell orders.
Confused yet?
Whats does “Volume Buying Now” mean, is that a value that changes hourly, daily, weekly?
Also what does “Movement” mean is that units/hour, per day, or over the last month. Love you tool and your efforts.
Comment by Berge — July 31, 2009 @ 8:42 am