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

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

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.

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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