Does the mode have to be unique? When is it not a useful way of describing a dataset?
Feedback: The mode does not have to be unique and, indeed, is not unique when:
• Every value in a dataset is different; then each value occurs with the same frequency (once), making the mode uninformative
• A number of values occur multiple times but the same number of times; then the mode is all of those values; multiple modes make data interpretation and comparisons more difficult
The mode provides the best summary for some weather and climate variables, such as wind direction.