Some people found a little bit confusing those "PR -1" values.
What did this -1 mean? It just meant that the given page had no pagerank at all.
You see, pagerank values go from 0 to 10, but it's a different thing to have a pagerank value of 0 than not having a pagerank value at all.
Having no pagerank values is a common state for new sites, which havent' yet been indexed by Google. And sometimes, an URL that had already been indexed and had a positive PR value, can see how its pagerank value is deleted temporarily (normally, to return to a higher PR value).
So now, to clarify things a bit, pagerankalert.com will show these -1 values as "NO PR", meaning just that: the state where the page hasn't got a pagerank value at all.
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