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 ?
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 differences in testosterone in nanomoles per liter between BPA quartiles presented in Table 1 correspond to 14% (95% CI: 4, 24%), 9% (95% CI: 1, 19%), and 18% (95% CI: 8, 28%) higher testosterone concentrations among men in the second, third, and fourth BPA quartiles, respectively, compared with testosterone concentrations of men in the lowest BPA quartile.
A quartile-wise analysis of the States reveals that the top two quartiles have lost shares.
Bidders are divided into five categories: those who have a feedback rating of 0 (the omitted category) and quartiles of bidders who have positive feedback ratings (in absolute value): those who have a rating of 1-2, those who have a rating of 3-5, those who have a rating of 6-22, and those who have a rating of more than 22.
Among those in the lowest quartile of idea density, only 7% were nondemented, while 44% of those in the highest quartile remained nondemented.
Among men, being in the highest quartile of waist circumference distribution produced a marginally significant 60 percent risk increase.
2001: 2008) that Medicare's 3-year coverage extension for all patients and lifetime coverage of immunosuppression medication for elderly and disabled individuals eliminated the income related disparity in graft survival rates, we assumed that the potential benefits of a coverage extension to those currently ineligible would have accrued to patients in the bottom three Zip Code median income quartiles rather than individuals in the highest income quartile, who are likely to be able to afford the medication even after Medicare's drug coverage expires.
Fourth quartile funds continue to have a higher probability of disappearing than any other group.
The Middle Two Quartiles -- Break-even or are modestly profitable
The experts divided the comparable closed-end funds into quartiles by price-to-NAV ratios.
Further study was conducted to determine if a significant difference existed in the reading achievement growth of fifth grade students initially scoring in the lower, middle, and upper quartiles for reading comprehension on the Terra Nova with and without participation in the Accelerated Reader program.
6 per 100 among those in the three lower quartiles.