Simulations show response-scale reliability plateaus around 5 to 10 categories when item error is fixed, and peaks at 4 to 7 categories when error grows as options increase.
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Don't Let Your Likert Scales Grow Up To Be Visual Analog Scales: Understanding the Relationship Between Number of Response Categories and Measurement Error
Simulations show response-scale reliability plateaus around 5 to 10 categories when item error is fixed, and peaks at 4 to 7 categories when error grows as options increase.