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Advantages of Standard deviation
a.Standard deviation is based on all the observations and is rigidly defined.
b.It is amenable to algebraic treatment and possesses many mathematical properties.
c.It is possible to calculate the combine standard deviation of two more group. This is not possible with any other measure.
d.It is less affected by fluctuations of sampling than most other measures of dispersion.
e.For comparing variability of two or more series coefficient of variation is considered as most appropriate and this is based on S. D mean.
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Models in OR
Disadvantage of standard Deviation It is not easy to understand and calculate. It gives more weight to the extremes and less to the items nearer to mean. Since
Method of Concurrent Deviations The coefficient of concurrent deviation or coefficient of correlation b the concurrent deviation methods is given by the formula. R
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