Merits and Demerits of Quartile Deviation ???
Answers
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⭕Merits of Quartile Deviation:⭕
(1) It is easy to calculate and simple to follow.
(2) It is not affected by the extreme values and is, therefore, useful in skewed distributions.
(3) It is the only method of dispersion applicable in case of open-end classes.
⭕Demerits:⭕
(1) Since Quartile Deviation is based on Quartiles, sometimes it is not rigidly defined.
(2) It does not take into account all the observations in the series. Hence it is not representative.
(3) It is not capable of further algebraic treatment.
(4) It is not a stable measure of dispersion as it is affected very much by fluctuations of sampling.
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Answer:-
Merits
· It can be easily calculated and simply understood.
· It does not involve much mathematical difficulties.
· As it takes middle 50% terms hence it is a measure better than Range and percentile Range.
· It is not affected by extreme terms as 25% of upper and 25% of lower terms are left out.
Demerits or Limitations
· As Q1 and Q3 are both positional measures hence are not capable of further algebraic treatment.
· Calculation are much more, but the result obtained is not of much importance.
· It is too much affected by fluctuations of samples.
· 50% terms play no role; first and last 25% items ignored may not give reliable result.