In
descriptive statistics, a decile is any of the nine values that divide the sorted data into ten equal parts, so that each part represents 1/10 of the sample or population. A decile is one possible form of a
quantile; others include the
quartile
In statistics, a quartile is a type of quantile which divides the number of data points into four parts, or ''quarters'', of more-or-less equal size. The data must be ordered from smallest to largest to compute quartiles; as such, quartiles are a ...
and
percentile.
[.] A decile rank arranges the data in order from lowest to highest and is done on a scale of one to ten where each successive number corresponds to an increase of 10 percentage points.
Special Usage: The decile mean
A moderately robust measure of
central tendency - known as the decile mean - can be computed by making use of a sample's deciles
to
(
= 10th percentile,
= 20th percentile and so on). It is calculated as follows:
:
Apart from serving as an alternative for the
mean and the
truncated mean, it also forms the basis for robust measures of
skewness and
kurtosis, and even a
normality test.
See also
*
Summary statistics
*
Socio-economic decile (for New Zealand schools)
References
Summary statistics
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de:Quantil#Dezil
ru:Квантиль#Дециль