# quartile

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## quartile

[kwor´tīl]
any of the three values that divide the range of a probability distribution into four parts of equal probability; the first, second, and third quartiles are the 25th, 50th, and 75th percentiles.

## quartile

[kwôr′təl, kwôr′tīl]
Etymology: L, quartus, fourth
one-fourth of the distribution of scores. The first quartile would be the lowest 25% of scores, the second quartile would represent the 26% to 50% range of scores, and so on.

## quartile

feature of descriptive statistics; area of a graph representing upper/lower 25% of particular population/cohort

## quartile

one of the values establishing the division of a series of variables into fourths, or the range of items included in such a segment.
References in periodicals archive ?
this group with high income steadily received an EBPI offer and was able to retain the highest proportion of EBPI-EYEM in the context of rising health care costs), the insignificant result of EBPI-EYEM coverage for the first quartile seems counter-intuitive.
They add an interesting wrinkle to the story: in both samples, bidders whose feedback rating is in just the first quartile (a rating of 1-2 in the golf club sample and a rating of 1-5 in the video game sample) submit their bids over 9 h closer to the end of the auction than bidders who have a feedback rating of 0.
The interquartile range is the length of the box, the difference between the third and first quartiles.
Second and third quartiles of cognitive ability were included in the model as dummy variables to restrict the comparison to the reference group (fourth quartile) and the first quartile.
This result follows the findings for the autocorrelations, with once again the strongest negative coefficient found for the first quartile.
6)] for the fourth quartile compared with the first quartile of acrylamide intake].
91 Quartile of zip code median income First quartile (reference) -- -- Second quartile 0.
The participants' diet was divided into ranges of fried food consumption, the first quartile related to the lowest amount of fried food consumed and the fourth indicated the highest amount.
Furthermore, if we related ADMA to SDMA by multiplication, the rank order of the quartiles in total mortality was also significantly reduced in the second compared to the first quartile (data not shown).
Being in the first weight-loss quartile at 1 month, with a 0%-l 1% excess weight loss, had a 39% positive predictive value for being in the first quartile at 12 months.
The company increased its production in the first quartile of the industry cost curve from 44 percent in 2004, to 48 percent in 2005, and is pursuing its objective of having 55 percent of smelter production in the first quartile of the industry cost curve by 2009.
has been ranked in the first quartile of its peer group for the past 1, 3, 5,
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