Auc-Stat-Simple

From Norganna's AddOns

Purpose

This is a simple statistics module designed to be an example of what can be done more than a really serious statistics module that provides highly accurate and configurable statistics.

It stores all the stats that it receives for an item on a given day as a mean value, and at the end of the day, rolls this data into 3, 7 and 14 day exponential moving averages (EMA).

Strengths

It can show you valuable trend data, so that you can see if an item's price is going up or down over time.

Weaknesses

It has several weaknesses, in that the "days" represented in the moving averages do not account for how many were seen on that day, or how many times you scanned during the day, or the completeness of the scans. A day is around 24 hours worth of scans even if you only scanned one time during the day.

The current day average is never tempered by long-term price trends. The current day average can be very fickle, which is why the 3-Day price is generally used instead of the current daily price for market price data (when it is available)