Methods of Measuring Dispersion

A statistical average does not till as about the scatterdness or dispersal from it. Thus only or the basis of statically averages, the analysis and interpretation of statistical facts is wrong and erroneous.The terms dispersion refers to the variability in the size of items. It Indicates that the size of items in a series in not uniform. The values of various items differ from each other.

Methods of Measuring Dispersion:

There are two mathematical methods of ascertaining dispersion :
    1. Methods of limits
    2. Methods of moments
    (a) Range (a) Mean deviation (b) Inter-Quantile Range  (b) Standard Deviation (c) Percentile Range (c) Other Measures (d) Quantile Deviation
    Range : Higher data value (H) -lowest data value(L)
    • Coefficient of Range
    • Inter quantile Range
    • Percentile Range
    • Semi Inter quantile Range
    Mean Deviation
    • Mean Deviation From mean
    • From Medium
    • From Mode
    Standard deviation: -Coefficient of standard deviations

    Author – Dr Archana Dusad

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