Fix grammatical errors in this sentence: Researchers have suggested that this occurs due to the closer comparison between the individual and the average peer, however use of this method means that it is impossible to know whether a participant has overestimated herself, underestimated the average peer, or both.
Researchers have suggested that this occurs due to the closer comparison between the individual and the average peer, however use of this method means that it is impossible to know whether a participant has overestimated themselves, underestimated the average peer, or both.