Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The value of the boundary at the 25th, 50th, or 75th percentiles of a frequency distribution divided into four parts, each containing a quarter of the population.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of the three points that divide an ordered distribution into four parts, each containing a quarter of the population.
  • n. Any one of the four groups so divided.

from the GNU version of the Collaborative International Dictionary of English

  • n. Same as quadrate.

from The Century Dictionary and Cyclopedia

  • n. That point on a frequency-curve above or below which one fourth of the total number of cases are found.
  • Involving an angular distance of 90°.
  • n. In astrology, an aspect of planets when their longitudes differ by 90°. See aspect, 7.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (statistics) any of three points that divide an ordered distribution into four parts each containing one quarter of the scores

Etymologies

Middle English, 90 degrees apart (of the relative position of two celestial bodies), from Old French quartil, from Medieval Latin quārtīlis, of a quartile, from Latin quārtus, fourth; see quart.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • It was a bet on the bottom 3/4th or so of American society, in particular on the second quartile from the bottom, because that’s where the incremental homeowners needed to push the home ownership from 64% to 69% would primarily come from.

    Real Homes of Genius

  • We are not top of the heap by any stretch of the imagination but we are aggressive, we are top quartile, which is where we are in funding.

    The Seattle Times

  • Birinyi called that the first phase, or "quartile," of the bull market.

    The Globe and Mail - Home RSS feed

  • He had found, predictably, that kids from the top economic quartile were most likely to go to college.

    The Good Fight

  • But he also found a lot of kids in the lowest economic quartile who had strong test scores, yet never went on to college.

    The Good Fight

  • “In fact, we did an analysis which shows that — next year — the number of schools not meeting their goals under NCLB could double to over 80 percent — even if we assume that all schools will gain as much as the top quartile in the state.”

    Defending Arne Duncan, sort of

  • (Seriously -- even full-time employment at $7.25/hour pays less than the Food Stamp eligibility limit for an worker with some dependent kids.) [1] The Labor Department defines an "experienced" worker as one who commands the 3rd-quartile wage in his job category.

    Immigration Quota Management, Arnold Kling | EconLog | Library of Economics and Liberty

  • Once his visa is granted the immigrant would file and pay Federal income tax every year, and if his W-2 income did not exceed the US 3rd-quartile wage for seven quarters out of every eight we would cancel his visa and make him leave the country.

    Immigration Quota Management, Arnold Kling | EconLog | Library of Economics and Liberty

  • GM, in the filing, said the restrictions place Mr. Akerson in the lowest quartile of compensation for comparable companies.

    GM Chief Earned $2.5 Million

  • Top-quartile funds are up 4.8% on average over the past year, while funds in the bottom quartile are down more than 5%.

    A Time for Dividends

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