Nominal variables name or categorize phenomena in a quantitative fashion
Computers and software programs do no understand what a treatment or a control means, nor male or female. With nominal variables, researchers are essentially the computer what the groups of interest are by creating a "grouping" variable at the inception of the data collection effort.
The grouping variable serves as a foundation for making group comparisons and understanding any multivariate associations.
Nominal variables and categorical variables are the same thing. Nominal is often used in the context of scales of measurement. Nominal variables are the lowest form of measurement in regards to precision and accuracy.
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