Decile
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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.
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. == 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 D_{1} to D_{9} ( D_{1} = 10th percentile, D_{2} = 20th percentile and so on). It is calculated as follows: DM = \frac{\sum_{i=1}^9 D_{i}} {9} 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== de:Quantil#Dezil ru:Квантиль#Дециль
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