Definitions

1. Quartiles are values that divide a sample of data into four groups containing (as far as possible) equal numbers of observations. (Web site)
2. The other quartiles are similarly denoted,, and.

Association

1. A similar model that adjusted for hypogonadism was used to examine the association of estradiol level (ranked as quartiles) with bone mineral density. (Web site)

Changes

1. Table 4 presents changes in serum cholesterol and LDL cholesterol concentrations according to quartiles of the initial cholesterol concentration.

Various Ways

1. The interquartile range is calculated using the 1st & 3rd sample quartiles, but there are various ways to calculate those quartiles. (Web site)

Distribution

1. The distances of the median to the quartiles give an indication of whether the distribution is symmetrical or skewed. (Web site)

Excel

1. I tried to figure out how excel calculates these quartiles when the population is not big enough. (Web site)

Box

1. Plot a symbol at the median and draw a box between the lower and upper quartiles. (Web site)
2. The median appears as a line in the box of a box-and-whisker plot and divides the middle two quartiles.

Range

1. The range of the middle two quartiles is known as the inter-quartile range. (Web site)

Quarters

1. Quartiles The division of the observation distribution into quarters (in the same way the median divides the distribution in half).

Standard Deviations

1. Procedures involving medians and quartiles are in general more resistant than those involving means and standard deviations.

Box Plot

1. A box plot of SAT scores displays median and quartiles.

Cumulative Distribution Function

1. The percentiles and quartiles are most conveniently read from a cumulative distribution function.

Data

1. Sometimes the minimum and maximum are presented along with the median and the quartiles to provide a five number summary of the data.
2. In the plot, a line is drawn between the first and third quartiles in the data. (Web site)

Ascending Order

1. Quartiles: When we order the data, for example in ascending order, we may divide the data into quarters, Q1�Q4, known as quartiles. (Web site)

Lower

1. Results are expressed as the median with the range in the text and tables, with upper and lower quartiles in the figures. (Web site)
2. The difference between the upper and lower quartiles is called the interquartile range. (Web site)
3. First, we need to construct the "box." To do so, we must find the upper and lower quartiles and the median. (Web site)

Quartile

1. Two other percentiles with special names are the quartiles: the lower quartile (the 25-th percentile) and the upper quartile (the 75-th percentile).

Data Set

1. People often use quartiles, which order the values in a data set into quarters, when dividing populations into groups based on sales and survey data.
2. The box part of the diagram is based on the middle (the second and third quartiles) of the data set.

Median

1. These values include the minimum, maximum, median and the lower and upper quartiles.
2. References to quartiles often relate to just the outer two, the upper and the lower quartiles; the second quartile being equal to the median. (Web site)
3. Quartiles If a data set of scores is arranged in ascending order of magnitude, then: The median is the middle value of the data set.

Percentiles

1. The accuracy in estimating the quantiles is comparable for both methods when the requested percentiles are between the lower and upper quartiles. (Web site)
2. The percentiles and quartiles are most conveniently read from a cumulative distribution function, as depicted in the following figure.
3. See how to use the PERCENTILE and QUARTILE functions to calculate percentiles, quartiles and deciles. (Web site)

Interquartile Range

1. Some common measures of dispersion are range, quartiles, interquartile range, standard deviation and variance.
2. Interquartile range (IQR) This is the difference between the upper (Q 3) and lower (Q 1) quartiles. (Web site)
3. The quartiles give an indication of variability: their difference is the interquartile range. (Web site)

Quartiles

1. It consists of 5 values: the most extreme values in the data set (maximum and minimum values), the lower and upper quartiles, and the median. (Web site)
2. Percentiles, including quantiles, quartiles, and the median, are useful for a detailed study of a distribution.
3. Specially named quantiles include the percentiles (q = 100), deciles (q = 10), quintiles (q = 5), quartiles (q = 4), and the median (q = 2). (Web site)

Categories

1. Science > Mathematics > Statistics > Interquartile Range
2. Percentiles
3. Quantiles
4. Science > Mathematics > Means > Median
5. Extreme Values
6. Books about "Quartiles" in Amazon.com
   

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