If I’m going to rank order candidates based on their combined scores from two or more separate exams, how should I weight the two exams relative to each other?
First of all, it only makes sense to use separate examinations if each exam is measuring a different set of knowledge, skills or abilities. Remember, you are going to base your procedures on the outcome of your job analysis. However, it is not as simple as just adding the two scores together and arranging candidates on a list. You may determine that Test A, which you want to measure the applicants’ communication skills, and Test B, designed to measure mathematics skill, should be equally weighted (i.e. 50/50). However, if everyone gets nearly the same score on Test A and scores vary widely on Test B, simply adding the scores together may give too much real weight to Test B. The score variance on Test A outweighs the variance on Test B and the final score will relate almost entirely on the outcome of Test B.
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