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Since measures of dispersion are usually called as averages of the second order, they should possess all the qualities of a good average. 

According to Yule and Kendall, they are as follows:

1) It should be easy to calculate and simple to follow./ 
2) It should be rigidly defined: For the same data, all the methods should produce the same result./ 
3) It should be based on all the items so as to be more representative./ 
4) It should be amenable to further algebraic treatment./ 
5) It should have sampling stability./ 
6) It should not be unduly affected by the extreme items.