Quartile Deviation Assignment Help

Measures of Dispersion - Quartile Deviation

Statistics >> Quartile deviation

Difference between third and first quartile is known as interquartile range and half of this difference is known as semi-interquartile range or Q.D.

Q.D. = (Q3- Q1)/2       

Co-efficient of Q.D. = (Q3- Q1)/(Q3+Q1) 

Merits and Demerits of Q.D.


(i)     It is easy to understand and calculate.

(ii)    It is not affected by extreme values. 

(iii)    It is rigidly defined.      


(i)     It is based on 50% observations only.

(ii)    It is not suitable for further algebraic treatment.

(iii)    It is affected much by fluctuations of sampling. 


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