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 ?
A post-hoc analysis of a prospective RCT (the Diabetes Prevention Program) comprising 3081 patients with impaired glucose metabolism who received metformin, a lifestyle modification program, or no intervention (placebo) found that metformin reduced the risk of developing diabetes only for patients in the highest risk quartile over 2.
Thus, when we compared the first with the second quartiles we found that all-cause death was increased almost 2-fold, i.
Although the cut-offs for these quartiles were sample-specific such that patients in the same quartile in round 2 may not have the exact same response to the survey questions in round 4, we found a similar level of disagreement when comparing the responses to the original survey items between rounds 2 and 4.
The poorest performing students (both Quartiles 1 and 2) were significantly less confident in their metacognitive judgments than the better performing students (both Quartiles 3 and 4), all ps < .
Also, while the difference between the price in auctions where the seller has 1-31 reports (Quartile 1) and the price in auctions where the seller has 32-205 reports (Quartile 2) is statistically significant at the 10% level, the price differences between auctions in any other pair of quartiles are not statistically significant, suggesting that returns to positive reports are in fact severely decreasing.
The model found that those in the top three quartiles of idea density were seven times more likely to have asymptomatic Alzheimer's at the time of their death than those in the lowest quartile.
The number of avoided deaths was calculated corresponding to one additional RN FTE/patient day and among quartiles of RN FTE/patient day.
The increase in OA episodes over the reference quartile was statistically significant for all three of the higher CVD risk quartiles.
Body fat percentage by skinfold thickness was significantly associated with RCC in men, with those in the highest quartile having a risk of RCC 2.
To determine the additional daily costs associated with graft failure, we calculated the slope of the cost curves for income quartiles 1, 2, and 3 (these are the cohorts that would have experienced improved graft survival rates from lifetime coverage) before and after graft failure.
The results of the IERC [Illinois Education Research Council] analyses indicated a less severe "gap" between the highest and lowest poverty district quartiles and a positive "gap" for high minority district quartiles when compared against the district quartiles with the lowest minority presence, as compared to results presented by The Education Trust.
The study participants were divided into quartiles based on their blood DHA levels.