n.choosing, as part of appraisal, a portion of a body of records for permanent retention through a statistical process that ensures each file within the series has an equal chance of being included in the retained set of recordsGuptill 1985, 86In selective sampling, records are chosen for their significance. This is a subjective judgment, and results are more biased than the sample proceeding from statistical sampling, which is systematic and objective. No matter what the method, records should be both voluminous and homogeneous.Fishbein 1987, 232Statistical sampling probably has greater justification because all units have an equal chance of being retained.Bradsher 1988, 106In 1978 a team of appraisers headed by Hindus appraised 35,000 cubic feet of Massachusetts Superior Court files dating from 1859 to 1959. The Hindus team examined 3,400 files of the 2.7 million case files and developed an appraisal plan based on their findings. The success of this project suggested that statistical sampling could be used to appraise the much more voluminous case files of the FBI.