题目
Published ratings on stocks ranging from 1 (strong sell) to 5 (strong buy) are examples of which measurement scale?
选项
A.Ordinal
B.Continuous
C.Nominal
答案
A
解析
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.A是正确的。排序数据可对观测值进行排序并分类，涉及到的数字仅用来识别类别，但不能确保类别间的差异是相等的。买入评级量表表明，排名5的股票预期表现优于排名4的股票，但它没有告诉我们排名4和5的股票与排名1和2的股票相比的表现差异是怎样的。