When those properties are graphed, the sites containing many percentages have a tendency to align together a mild curve, except for spam internet sites. Spam websites cluster beyond that gentle curve. Those clusters are referred to as outliers, because they exist beyond the normal ranges. Web site uy tín http://images.google.tn/url?q=https://sites.google.com/view/howtousesearchengineranker/how-to-use-search-engine-ranker