Definition of quartile in English:



  • 1Each of four equal groups into which a population can be divided according to the distribution of values of a particular variable.

    • ‘Children in the upper quartile of the blood-lead-concentration distribution donated another blood sample in February 1993.’
    • ‘The school is one of several elementary schools within a district that is in the bottom quartile when fourth grade standardized test scores and passage rates are compared throughout the state.’
    • ‘The initial categories were created by stratifying lesions into quartiles according to size.’
    • ‘White women were older, smoked more, and were less likely to have dietary calcium intakes in the lowest quartile of distribution than black and Hispanic women.’
    • ‘The resulting distributions for men and women were divided into quartiles.’
    1. 1.1Each of the three values of the random variable that divide a population into four groups.
      • ‘We calculate medians and quartiles of the age at leaving home by sex and race, using a fitted curve derived from a logit regression model.’
      • ‘Here we would like to estimate the quartiles of the distribution of age at leaving home, within categories of covariates.’
      • ‘Every measurement was first divided by its plate's quartile and then multiplied by the average quartile of the respective experiment.’
      • ‘Simple quartiles cannot be defined in interval variables unless their boundaries chance to fall at interval boundaries.’
      • ‘Disparities in college enrollment by family income quartiles are almost as large today as they were thirty years ago.’


Late 19th century: from medieval Latin quartilis, from Latin quartus fourth.