Full context:   Normative influence, a function of social impact theory, has three components. The number of people in the group has a surprising effect. As the number increases, each person has less of an impact. A group's strength is how important the group is to a person. Groups we value generally have more social influence. Immediacy is how close the group is in time and space when the influence is taking place. Psychologists have constructed a mathematical model using these three factors and are able to predict the amount of conformity that occurs with some degree of accuracy.