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Single set
Reading time: 1minThese commands summarize a set of data. Somehow, they're able to measure its centre or its variability. Because there are multiple definitions for that, there are also multiple measures.
| Description of a single sample | |
|---|---|
 |
Mean, arithmetic mean, average. |
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This is used to summarize measures with different units (length, cost, weight,...) of the same object. It has no sense alone, but it is helpful for comparisons among multiple objects. |
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This is used for ratios and rates, as in the context of speed. |
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A measure of variability that is convenient for calculations |
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A measure of variability that has the same physical units of the data |
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A central measure, alternative to mean, is more robust, meaning it isn't affected by extreme data, generally known as outliers. |
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These values divide the data once ordered into four groups of the same size. They're used to measure variability. See the formula reference section for details. |
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Most frequent value in data. It can be a set if there are ties. |