Computing Methods
There is no universal agreement on choosing the quartile values.
One standard formula for locating the position of the observation at a given percentile, y, with n data points sorted in ascending order is:
- Case 1: If L is a whole number, then the value will be found halfway between positions L and L+1.
- Case 2: If L is a fraction, round to the nearest whole number. (for example, L = 1.2 becomes 1).
Read more about this topic: Quartile
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