Anchor: We do not know whether the discrepancy is more frequent in case studies than in other methods.
Entailed: Some people don't know if a discrepancy occurs more in case studies than in other methods. 
Contradiction: There have been no discrepancies observed in case studies nor other methods.
Contradiction: They are watching tv
Contradiction: The runner is moving.
Contradiction: Had he come back for thanks?
Contradiction: Two women are not at home.