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[edited by: tedster at 2:47 pm (utc) on Mar 1, 2013]
"To calculate average position, we take into account the top ranking URL from your site for a particular query. For example, if Janeís query returns your site as the #1 and #2 result, and Davidís query returns your site in positions #2 and #7, your average top position would be 1.5."
Not quite sure what to make of that...
[edited by: Robert_Charlton at 7:15 am (utc) on Mar 15, 2013]
we noticed the traffic drops one week before the official announcement. So we actually saw the drops around the 7th, same as previous Panda runs we saw drops 7 days before the official date.