Say that I have performed a survey in which I have asked subjects to use a three-item, five-point Likert scale to rate three scenarios. My data would be formatted to look something like this (Sx indicates scenario, Ix indicates item):
Subject S1_I1 S1_I2 S1_I3 S2_I1 S2_I2 S2_I3 S3_I1 S3_I2...