In Widom's study of the effects of child abuse and its impact upon later criminal offenses, she selected a sample of children with court records of being abuse victims and gathered a comparison group that were matched on gender, race, age and socioeconomic status. The technique used in this case was ____.

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The technique used in this case was individual matching since each abuse victim was matched with a comparison group member of the same gender, race, age and socioeconomic status, indicating a one-to-one matching process. Aggregate matching involves matching groups on certain criteria rather than individuals, while randomization involves assigning participants to groups at random. Probabilistic aggregation is not a recognized statistical technique.

In Widom's Study of the Effects of Child Abuse and Its