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One of the quality signals I definitely thought Panda would take into account are spelling and grammar based upon my past training in tests and measurements. Amazingly after two months of ongoing study it seemingly has little impact. In fact upon close inspection I am saw sites in the top results with grammar so horrific its jaw dropping. The first few sentences of the page could fool anybody but the rest could be total mush. My conclusion was what I thought would be a major factors in discerning quality were not. In fact the availability of so many faulty pages practically eliminated the idea that the “bottom of the barrel” pages had been eliminated. In other words Panda seems very forgiving in areas related to grammar and spelling. The only thing that did emerge, that I wasn’t testing, was there seemed to be page templates almost immune to Panda. In that case it could have been a high number of similar templates catching my eye.
I do nothing with 'Panda in mind' but do many things in favor of the visitors.
Anyway, he had a very specific checklist of things to do that would aid recovery. I didn't follow along as quickly as I should've, but one thing he said to do was split good content from bad so the bad doesn't affect the good. That's why the subdomain thing helped them - not because of subdomains but because the bad authors didn't kill the good authors.