# 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 ?
Then we compare the average SEO underpricing of the upper quintile versus that of the lower quintile, the upper quartile versus the lower quartile, and the first half of low-priced SEOs against the second half with high-priced offerings.
The large standard errors for the means of nitrate-N and EC, ranges for max-rain and upper and lower quartiles, and the high CV for the solutes indicated that within-season temporal variations were significant.
The difference between the median nutrient values for subjects in the upper quartile and subjects in the lower quartile was 25.
25% PV at zero change: \$1,715,349 \$1,715,349 \$1,691,321 Mean PV: \$1,663,967 \$1,734,033 \$1,709,870 Std Dev of PV: \$166,840 \$167,742 \$165,681 Median: \$1,650,036 Upper Quartile NPV: \$1,955,008 Lower Quartile NPV: \$1,523,858 PV at zero change, Mean PV, and Std.
The odds of having had a dental cleaning are 80-90 percent higher for a person in the two lower quartiles than they are for a person in the highest quartile.
With respect to CHD, we observed a "threshold"; ~13% more men in the lower quartile of plasma TAOS had CHD compared with the combined upper quartiles.
On average, top quartile advisors spend more than twice the amount per staff than those in the lower quartile
According to the RICS's affordability and accessibility index, covering the fourth quarter (Q4) of 2007, an average first-time buyer couple, both on lower quartile earnings (totalling pounds 26,595 after taxes), will now have to save up to the equivalent of 104% of joint take-home pay, to build up the pounds 27,729 needed for up-front buying costs on a typical home - including the deposit, fees and stamp duty.
Moreover, the lower quartile range - which gives an average over the lowest quarter of pay deals - was just 2.
Following Peacock, Devlin, and McGee (1999), the change in equity was first assessed by comparing and tracking the difference in resource distribution between the upper and lower quartile of the submedical districts to see if the discrepancy reduced annually (indicative of improved equity) over the study period.
A council was given four points for appearing in the upper quartile of the league in each category, down to just one point for appearing in the lower quartile of the league.
7 hprd in both 1999 and 2000 (Group 1: lower quartile homes), six homes that reported 3.

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