What on earth is nominal data? The term itself is intimidating, yet its meaning is astonishingly simple.
Ever notice how sometimes we use words to describe things that don’t really mean anything by themselves? For instance, we use words like man and woman to describe different sexes (although that might change soon). But do the titles actually mean anything on their own? What if they were switched around? If we called men, women and women, men, would there be any real difference? Probably not. The words themselves are arbitrary titles we chose to classify different kinds of people. That’s nominal data.
To put it briefly, nominal data is data where subjects are merely allocated to distinct categories for the specific use of classification.