How to find a quartile If we divide a list of journals ordered from highest to lowest Journal Citation Reports: Impact Factor, by 4, we will obtain 4 groups of journals: each set is a quartile. In a list of 100 journals, for example, the first quartile is the first 25.
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To calculate the quartile of a data series, after sorting from lowest to highest, we can use the following formula, where a will take the values of 1,2 and
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José Andalón explains the concept of quartiles in a sequence of unclustered data and exercises.
