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## 7.1.4 Quartile Deviation

Quartile deviation or semi-interquartile range Q is given by Q = ½ (Q where Q Quartile deviation is definitely a better measure than the range as it makes use of 50% of the data. But since it ignores the other 50% of the data, it cannot be regarded as a reliable measure. |

Last modified: Thursday, 22 March 2012, 10:06 AM