Which level of measurement involves order and rank?

The ordinal scale is characterized by the presence of order and rank among the values it measures. In this scale, the data can be arranged in a ranked order, indicating the relative position of each value, but the intervals between the ranks are not necessarily equal. For example, when surveying preferences, first, second, and third choices can show relative standing, but the difference in preference between the first and second choice may not be the same as the difference between the second and third.

This distinct feature makes the ordinal scale suitable for assessing ranks, such as in rating scales (like satisfaction levels), where the rank carries significance regarding the order of preference or intensity, but not the precise quantification of the difference between ranks. Other scales, such as nominal, interval, and ratio, either lack an inherent order, do provide equal intervals without a true zero, or include a true zero point that permits meaningful ratios, respectively. Thus, the defining characteristic of the ordinal scale as one involving order and rank clearly establishes it as the correct choice.