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In the "good old days" pre panda, articles/ content could rank for anything -- even when people wanted to shop, not read. Big retailers wouldn't clutter up their slick stores with tonnes of content just to compete, so content sites did disproportionately well -- even when they were just in the way of searchers' real intentions. Not under Panda.
So what you are basically saying is that there is no way to identify the specific pages that caused the pandalization.
If your site is a square peg and users are looking to fill a round hole, you can write Nobel-prize winning prose, but it won't make a jots worth of difference.
Maybe this is micro not macro....
If enough of your pages do not fulfil the ‘profile’ for the targeted queries- you will ultimately see a site wide demotion?
[edited by: suggy at 3:56 pm (utc) on Jul 4, 2011]
but I've also substantially increase the quality of remaining pages to no affect.
There may not be a discoverable pattern, ever.
I'm no SEO novice, and I've been looking at this non-stop for 5 months. Many other "experts" have too. If it were simple, we'd have seen it already.
Maybe someone (G) needs to remove the [en.wikipedia.org...] . Until then, almost whatever you do will not matter.
[edited by: indyank at 5:10 pm (utc) on Jul 5, 2011]
It's definitely possible to see some gains even while under the devaluation, and I think that's fooling some.