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Moderator Variables in Prediction, with Special Reference to Freshman Engineering Grades and the Strong Vocational Interest Blank

Saunders, David R.
Publication Year:
Report Number:
ETS Research Bulletin
Document Type:
Page Count:
Subject/Key Words:
Engineering, Grade Prediction, Interest Inventories, Majors (Students), Moderator Variables, Strong Vocational Interest Blank, Suppressor Variables


The Accountant Scale of the Strong Interest Blank for Men bears little direct relation to a criterion of freshman engineering grades. However, it may act as a suppressor variable in conjunction with the Banker or Psychologist Scale of the Strong. It may also act as a moderator variable in conjunction with the Math.-Science Teacher or Real Estate Salesman Scale. These effects are illustrated by results obtained in two engineering schools. The basic algebra and geometry of moderator variables is given.

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