Why are Decile ranks used instead of percentiles of quartiles?
Answers
Answer:
Decile rankings are just another way to categorize data. Which system you use is usually a judgment call. For example, if you wanted to display class rankings on a pie chart, using deciles would make more sense that percentiles. That’s because a pie chart with 10-categories would be much easier to read than a pie chart with 99 categories.
Step-by-step explanation:
Deciles and decile ranks are used more often in real life than in the classroom. For example, Australia uses decile ranks to report drought data. Deciles 1-2 represent the lowest 20% (“much below normal”). That means droughts that are “much below normal” don’t occur more than 20% of the time.
Deciles are also commonly used for college admissions and high school rankings. For example, this chart from Roanoke College shows the high school decile rankings for the student body.
Decile is used to categorize large data sets from highest to lowest values, or vice versa. Like the quartile and the percentile, a decile is a form of a quantile that divides a set of observations into samples that are easier to analyze and measure.