noun
a statistical term that divides a set of data into four equal parts, each representing 25% of the total
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The data set is divided into quartiles to analyze the distribution of values.
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We need to figure out which quartile your score falls into for the test.
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I'm in the top quartile of my class, so I'm feeling pretty good about my grades.
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She was in the third quartile of her training program, showing steady progress towards her goal.