Difference between revisions of "Median"
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| − | A '''median''' is the middle number in an ordered numerical sequence. | + | A '''median''' is the middle number in an ordered numerical sequence. If there are two middle numbers (i.e. there is an even number of terms in the sequence), then the median is found by taking the [[mean]] of the two middle numbers. |
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So in an example of the following numerical values: | So in an example of the following numerical values: | ||
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:2,4,5,11,13 | :2,4,5,11,13 | ||
| − | The Median is 5, as there are 2 values | + | The Median is 5, as there are 2 values less than 5 and 2 values greater than 5. |
The median can sometimes be a better measure of centrality than the mean, as it is unaffected by outliers. | The median can sometimes be a better measure of centrality than the mean, as it is unaffected by outliers. | ||
Revision as of 12:37, December 11, 2009
A median is the middle number in an ordered numerical sequence. If there are two middle numbers (i.e. there is an even number of terms in the sequence), then the median is found by taking the mean of the two middle numbers.
So in an example of the following numerical values:
- 2,4,5,11,13
The Median is 5, as there are 2 values less than 5 and 2 values greater than 5.
The median can sometimes be a better measure of centrality than the mean, as it is unaffected by outliers.