(redirected from Quartiles)
Also found in: Thesaurus, Medical, Financial, Encyclopedia.
Related to Quartiles: percentiles


 (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.


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
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


(ˈkwɔr taɪl, -tɪl)

(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)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


[ˈkwɔːtaɪl] Ncuartil 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


[ˈkwɔːtaɪl] nquartile m
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
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.
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.
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".
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.
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%.
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.
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.
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.
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).
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.
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)).
(11) We conduct our analysis across price-spread quartiles, which are defined over the entire time series and summarized in Table 4.