Ordinal data, also known as ranked data, is a type of data that has a natural order or ranking, but the differences between consecutive values are not equal. Examples of ordinal data include:
The choice of statistical test depends on the research design: are you comparing independent groups, or are you measuring the same subjects at different time points? Ordinal data, also known as ranked data, is
However, are still preferred for teaching, small samples, and exact p-values. The middle value is the best measure of
The middle value is the best measure of central tendency for ordinal data. Spearman’s Rho is the standard choice.
This shows the spread of the middle 50% of your data. Effect Size: For Mann-Whitney or Wilcoxon, calculate to show the magnitude of the difference. Conclusion
Mann-Whitney U Example: Compare pain scores (ordinal) between Treatment vs. Placebo groups.
When you want to see if two ordinal variables are related (e.g., Does "Job Satisfaction" correlate with "Employee Loyalty"?), Spearman’s Rho is the standard choice.