The semiquartile range is half the difference between the quartiles. So find Q3 and subtract Q1 then divide that number by 2.
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The semi interquartile range is a measure for spread or dispersion. To find it you have to subtract the first quartile from Q3 and divide that by 2, (Q3 - Q1)/2
The interquartile range :)
If the result is 1.5 x Inter Quartile Range (or more) above the Upper Quartile or 1.5 x Inter Quartile Range (or more) below the Lower Quartile.
It is the upper quartile minus the lower quartile.
the IQR is the third quartile minus the first quartile.