116 lines
2.1 KiB
Markdown
116 lines
2.1 KiB
Markdown
---
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title: "Decile"
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chunk: 1/1
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source: "https://en.wikipedia.org/wiki/Decile"
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category: "reference"
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tags: "science, encyclopedia"
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date_saved: "2026-05-05T12:22:20.766128+00:00"
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instance: "kb-cron"
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---
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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 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.
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== Decile mean ==
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A moderately robust measure of central tendency, known as the decile mean, can be computed by making use of a sample's deciles
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D
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1
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{\displaystyle D_{1}}
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to
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D
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9
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{\displaystyle D_{9}}
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(
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D
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1
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{\displaystyle D_{1}}
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= 10th percentile,
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D
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2
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{\displaystyle D_{2}}
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= 20th percentile and so on). It is calculated as follows:
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D
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M
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=
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∑
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i
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=
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1
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9
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D
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i
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9
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{\displaystyle DM={\frac {\sum _{i=1}^{9}D_{i}}{9}}}
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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.
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== See also ==
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Summary statistics
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Socio-economic decile (for New Zealand schools)
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== References == |