问题如下：
Published ratings on stocks ranging from 1 (strong sell) to 5 (strong buy) are examples of which measurement scale?
选项：
A. Ordinal
B. Interval
C. Nominal
解释：
A is correct.
Ordinal scales sort data into categories that are ordered with respect to some characteristic and may involve numbers to identify categories but do not assure that the differences between scale values are equal. The buy rating scale indicates that a stock ranked 5 is expected to perform better than a stock ranked 4, but it tells us nothing about the performance difference between stocks ranked 4 and 5 compared with the performance difference between stocks ranked 1 and 2, and so on
老师，能否能把这个知识点几个排序分别介绍一下，感觉英文和这个排序有点对不上，有没有更好的记忆方法。
