Similarly, the credibility rank of a user Rank(u i ) is defined as the increase in the posterior probability that a user is credible, normalized by prior probability P(u t i ).
we can get: (2) In our previous work, we showed that the following relations hold true regarding the credibility rank of a claim Rank(c j ) and a user Rank(u i ): where Users j is the set of users makes claim c j , and C laims i is the set of claims the user u i makes.