Читать книгу Statistics and Probability with Applications for Engineers and Scientists Using MINITAB, R and JMP - Bhisham C. Gupta, Irwin Guttman - Страница 42

As previously mentioned, nominal data contain the smallest amount of information. Only symbols are used to label categories of a population. For example, production part numbers with a 2003 prefix are nominal data, wherein the 2003 prefix indicates only that the parts were produced in 2003 (in this case, the year 2003 serves as the category). No arithmetic operation, such as addition, subtraction, multiplication, or division, can be performed on numbers representing nominal data. As another example, jersey numbers of baseball, football, or soccer players are nominal. Thus, adding any two jersey numbers and comparing with another number makes no sense. Other examples of nominal data are ID numbers of workers, account numbers used by a financial institution, ZIP codes, telephone numbers, sex, or color.