The prices that Ecurnomics shows on the graph and the daily averages...is that of the price of the item that was sold/cancelled, or is it just the prices of the items in the auction house?
It's the "list price", or the price set by the seller.
In a rational market, the list prices should adjust to what people are prepared to pay. I can't say whether the Glitch market is rational or not though :D
My algorithm drops outrageously high outliers. I figure we're not really interested in prices that are just outright mistakes. Also, if you don't drop outliers then one crazy price can ruin the scaling of the chart.