半内四分位距 semi-interquartile range

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The semi-interquartile range is a measure of spread or dispersion. It is computed as one half the difference between the 75th percentile [often called (Q3)] and the 25th percentile (Q1). The formula for semi-interquartile range is therefore: (Q3-Q1)/2.

You have 10 samples.

Q1 occurs at 25% of 10 = 2.5 .
So you average the 2nd and 3rd sample. = 40

Q3 occurs at 75% of 10 = 7.5 .
So you average the 7th and 8th sample = 7.45.

Then you calculate the semi-IQR based on the formula above.

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关键词：Quartile inter range semi Inte difference therefore average

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