请问统计学中名义变量怎么解释,能举个例子吗

题目

请问统计学中名义变量怎么解释,能举个例子吗
本人正在自学 discovering statistics using SPSS这本书,毫无统计学相关经验
请问 名义变量 nominal variable 能举个具体例子吗
书中说 When two things that are equivalent in some sense are given the same name (or number) ,but there are more than two possibilities ,the variable is said to be a nominal variable.

答案

是指人为划分的多种类别,如学业成绩划分为优良中差四类,在SPSS中对这四类赋值,不能计算,相同的数字代表一类成绩.