A quartile is a given section in a range of data. To find the quartile, you must first find the median. Then find the "median of the median", using these to separate your data into sections, giving you a total of four sections of data.
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It's statistics: If you have a sorted list of numbers, the lower quartile is the number that is one quarter from the start of the list.Or you can say that it's the number where one quarter of the entries in the list is smaller than or equal to that number.
What is coefficient of quartile deviation?
In a data sample, the purpose of quartile deviation is a way to measure data dispersion instead of using the range. The quartile deviation is found by subtracting the lower quartile from the upper quartile, and dividing this result by two.
Interquartile Range, or IQR
coefficient of quartile deviation: (Q3-Q1)/(Q3+Q1)