Dictionary.net

A type of analysis in which subjects in a study group and a comparison group are made comparable with respect to extraneous factors by individually pairing study subjects with the comparison group subjects (e.g., age-matched controls).

A paired comparison is usually a method in which a certain employee, and his/ her job is compared with another employee of a similar post, and his/ her job. Usually, such paired comparisons are made on the grounds of the overall performance of an individual. Once the ratings are provided, the scores are derived by taking the mean and the standard deviation from all of the scores to come to a standard which would be used to measure all future comparisons.