Google ranking algorithms are beyond prediction, which often make webmasters make wrong assumptions. The recent webmaster video by Matt Cutts is clarifying one such ranking notion.
Cutts is answering the question:
“Do Google use the same algorithm to rank all the results on page 1, or different algorithms for a wider variety in the results? (Pos. 1-3 – primary focus on freshness Pos. 4-6 – primary focus on backlinks Pos. 7-10 – primary focus on social signals)”/
Focusing only on web rankings, Matt Cutts said that in general, rankings are not different for position 1-3, 4-6, or 7-10. It's the same algorithm that returns lots of web results, may be hundreds and thousands. Google just sorts them in order, what it thinks is the trait of relevancy versus repetition. There could be a result that is very relevant but repetitive as well. It's the same algorithm that generates all those sorted list of results that show up on the first page. For web rankings, there's nothing like the position is saved for a certain category. It's the same algorithm that is generating the list of search results.Search Results at Different Positions Not Shown by Different Algorithms: Matt Cutts!,