The researchers randomly assigned half of the patients to get radiation therapy.

The researchers randomly assigned about half the patients to a depression treatment program within the general practice that included psychotherapy and drugs.

The researchers recruited about 100 volunteers ages 13 to 18 and assigned half to the group that was asked to give up the drinks.

The researchers compared outcomes for some 600 women randomly assigned to one procedure or the other.

To control for this, the researchers assigned all the participants a score based on how closely they followed that healthy diet.

To test which method worked best, the researchers randomly assigned the seventh graders to one of four groups.

The researchers assigned half the patients to have their usual office visits.

The researchers randomly assigned 419 children younger than 7 to one treatment or the other.

The researchers assigned a socioeconomic status score to each patient by matching the home address to economic data in the 2000 census.

Next, the researchers randomly assigned the students to play one of two video games for four to six weeks.