lot of people said that traffic effect the SEPR. beside the number of visitor, does average time on site also effect SEPR? and what other factor that effect SEPR? Thanks before..
No one knows for sure. Many will say no, its all on page and back links. I tend to disagree with them. If you look at the original formulation of the Google algorithm when the guys were at stanford, the algorithm is based around backlinks, anchor text and on page use of text. However, there were many parameters in the model which they claimed needed to be optimized. The optimization method needs a feedback feedback function and they suggested having trusted users provide feedback on the results. I think they would still incorperate an optimization on the algorithm but the feedback would be based on data, rather than user feedback. The sort of data they would use would be click throughs, but this only implies the title and descrption would be nice, so I imagine they would measure whether the user bounces back in a limited period of time. They could go alot deeper than this with the sort of data they now have, but I think the above is a fairly safe assumption to start with. As well as optimizing the algorithm as a whole, they could use it to provide feedback on the ranking of individual sites as well. If this was the case, it would be primarily backlinks and on page, with smaller movements based on time spent and the like.
If you look at it that way, there could be tons of factors influencing one's ranking While user feedback is indeed considered important, I'm not sure Google has a perfect way to detect whether people genuinely got what they wanted or not. If it directs you to a particular page, and that page contained exactly what you wanted, and you got out without making a single click anywhere, does it mean you were unsatisfied ? No, but your statistics program will show that the user went to one page and no where else. The user may press the back button to go back to the results and look at other opinions on the topic for which he is searching- he may have already got the basic gist of what he wanted from your site. Not all sites use Google Analytics, and therefore it has no way of truly assessing whether the person is satisfied or not. If it did use Analytics, people would shy away from using it in the fear of losing their rankings. Then you obviously have the sabotage factor- competitors using different IP's, spending little time and going away. It is for you to decide.
it doen't matter how fast your site to load it could not be serves as an advantage to your site, google only based on how many backlinks you have to other sites.
are you mean SERP? it doesn't matter having the average time building your site, as long as you perform on page and off page properly.