Keyword Analysis & Research: measures of spread

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What are the three measures of spread?

The three most common measures of spread or variability are the range, the interquartile range (IQR), and the standard deviation (SD). The range of a list is the largest value minus the smallest value. It is the width of the smallest interval that contains all the data, so it measures spread.

What measure of spread is most resistant to outliers?

The IQR is the length of the box on a boxplot. Notice that only a few numbers are needed to determine the IQR and those numbers are not the extreme observations that may be outliers. The IQR is a type of resistant measure. The second measure of spread or variation is called the standard deviation (SD).

What are the measures of spread in statistics?

Measures of spread (also called measures of dispersion) tell you something about how wide the set of data is. There are several basic measures of spread used in statistics. The most common are: The range (including the interquartile range and the interdecile range), The standard deviation, The variance, Quartiles.