What are Levels of measurement in statistics?

Answer 1

Nominal, ordinal, interval and ratio (NOIR) are four levels of measurement typically recognized in the statistical literature. At the nominal level, objects are categorized with names, identifiers or labels such as colors like red, yellow and blue. TAnother example is the answers on a survey sheet, Yes, No, and Undecided. At the ordinal level, the data can be ordered. Course grades A,B, C, D and E is an example. At the interval level, the data can be ordered and the difference between data values has meaning. Temperature in degrees F is an example. At the ratio level, there is a natural zero starting point and differences and ratios have meaning.