An ordinal scale of measurement considers variables when the order is important but the differences are unimportant. Think about the term 'order' when you hear the word 'ordinal.' We don't know how much better an A is than a D in terms of letter grades. We know that A is superior to B, which is superior to C, and so on. Is A, however, four times better than D? Is it twice as good? The sequence is crucial in this example, but not the differences.
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