StATS: What is ordinal data?
Ordinal data are categorical data where there is a logical ordering to the categories. A good example is the Likert scale that you see on many surveys: 1=Strongly disagree; 2=Disagree; 3=Neutral; 4=Agree; 5=Strongly agree.
While computation of a median is easily justified for ordinal data, some statisticians have reservations about computing a mean for ordinal data.
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