quartile

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quar·tile

(kwôr′tīl′, -tĭl)

n. Statistics

1. Any of the groups that result when a frequency distribution is divided into four groups of equal size.

2. Any of the values that separate each of these groups.

[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, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

quartile

(ˈkwɔːtaɪl)

1. (Statistics) statistics one of three actual or notional values of a variable dividing its distribution into four groups with equal frequencies

2. a quarter part of a distribution

adj

3. (Statistics) statistics denoting or relating to a quartile

4. (Astrology) astrology denoting an aspect of two heavenly bodies when their longitudes differ by 90°

[C16: from Medieval Latin quartīlis, from Latin quartus fourth]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

quar•tile

(ˈkwɔr taɪl, -tɪl)

n.

(in a frequency distribution) one of the values of a variable that divides the distribution of the variable into four groups having equal frequencies.

[1875–80; « Latin quārt(us)]

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Noun

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

mark, score, grade - a number or letter indicating quality (especially of a student's performance); "she made good marks in algebra"; "grade A milk"; "what was your score on your homework?"

statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters

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Spanish / Español

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cuartil

quartile

[ˈkwɔːtaɪl] N → cuartil m

Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

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References in periodicals archive ?

They then separated the participants into quartiles according to their maximal muscle power, with quartile one being low and quartile four being high.

Increased muscle power may prolong life

Upon dividing the patients within the normal range into quartiles based upon their free [T.sub.4] level, he and his coinvestigators found that the baseline prevalence of atrial fibrillation was 8.7% in those in quartile 1, 9.3% in quartile 2, 10.5% in quartile 3, and 12.6% in quartile 4.

HEART FAILURE: 90-day risk higher with new hypothyroidism

Within the competitive cyclists considered "very fit", demographic quartiles were established (Statistica[TM], Statsoft) based on their maximal oxygen consumption (V[O.sub.2] max) values with quartile 1 being the "least fit" and quartile 4 being the "most fit".

A Comparison of Heart Rate Measures between Fit Cohorts of Cyclists

The participants were categorized into four groups based on the P[M.sub.2.5] quartiles. When P[M.sub.2.5] was treated as a continuous variable, effect estimates were calculated as changes in blood pressure for each 10-[micro]g/[m.sup.3] increment in the 2-y average P[M.sub.2.5] concentration.

Long-Term Exposure to Fine Particulate Matter, Blood Pressure, and Incident Hypertension in Taiwanese Adults

From 2004 to 2007, the share of mortgage balances held by investors in the middle quartiles of the credit score distribution rose from 20% to 35%.

Mortgages and the Financial Crisis

When the 310 children with ASDs were compared with 1,240 control participants, the risk of ASDs was significantly increased in each of the three lower quartiles of Vitamin D level at birth, when compared with the highest quartile - an increased risk of ASDs by 260 per cent in the lowest quartile, 150 per cent in the second quartile, and 90 per cent in the third quartile.

Vitamin D deficiency at birth ups autism risk

These dummies denote EF observations belonging in the second, third, and fourth quartiles of the distribution; the comparison group is always the bottom quartile and thus the lowest economic freedom.

Growth, inequality, and economic freedom: Evidence from the U.S. states

Thus, if the original paper presented the age-, sex-, and BMI-adjusted association of the candidate marker categorized into quartiles as the main model, the present study likewise used this adjustment set and marker quartiles.

The Longer, the Better? An Empirical Study of the Extent and Mechanisms of Attenuating Biomarker Associations in Cardiovascular Patient Cohorts

Subjects were divided equally into four groups (quartiles) based on thyroid laboratory testing as follows: thyroid-stimulating hormone (TSH, [mu]IU/mL) quartiles, Q1 (TSH < 1.30), Q2 (1.30 [less than or equal to] TSH <1.90), Q3 (1.90 [less than or equal to] TSH < 2.75), and Q4 (TSH [greater than or equal to] 2.75); free thyroxine (free T4, ng/dL) quartiles, Q1 (free T4 < 1.15), Q2 (1.15 [less than or equal to] free T4 < 1.26), Q3 (1.26 [less than or equal to] free T4 < 1.38), and Q4 (free T4 [greater than or equal to] 1.38); and triiodothyronine (T3, pg/mL) quartiles, Q1 (T3 < 2.87), Q2 (2.87 [less than or equal to] T3 < 3.12), Q3 (3.12 [less than or equal to] T3 < 3.40), and Q4 (T3 [greater than or equal to] 3.40).

Glaucomatous Optic Nerve Changes and Thyroid Dysfunction in an Urban South Korean Population

For purposes of this secondary analysis, participants were divided into quartiles according to baseline age: Quartile 1 patients were up to 54 years old; quartile 2 were ages 55-60; quartile 3 were ages 61-67; and quartile 4 were ages 68 and up.

CABG reduced cardiovascular mortality in patients with ischemic heart failure, regardless of their age

Investigators stratified patients who met National Cholesterol Education Program Adult Treatment Panel III (NCEP ATP III) criteria for metabolic syndrome into risk quartiles for progression to diabetes using a model they developed based on 7 parameters: fasting plasma glucose, hemoglobin Ale, history of high blood glucose, waist:hip ratio, waist circumference, triglycerides, and height (TABLE (1)).