1-12. I have not used the coefficient of dispersion or quartile coefficient of dispersion much. It is defined as Coefficient of Quartile Deviation = 31 31 3131 QQ 2 QQ QQQQ 2 = + + It is pure number free of any units of measurement. When the coefficient of quartile deviation is small, it indicates high uniformity or fundamental rule about relative measures of dispersion here. Types of Measures of dispersion,Range, Quartile Deviation, Mean Deviation. They are less useful for understanding your own dataset. A relative measure of dispersion based on the quartile deviation is called the coefficient of quartile deviation. The coefficients of dispersion are calculated (along with the measure of dispersion) when two series are compared, that differ widely in their averages. 6, pp. There are four coefficients which are commonly referred, namely. It can be used for comparing the dispersion in two or more than two sets of data. Since it is based on quantile information, it is less sensitive to outliers than measures such as the Coefficient of variation.As such, it is one of several Robust measures of scale. A relative measure of dispersion based on the quartile deviation is called the coefficient of quartile deviation… 48, pp. In my mind, they have a very specific use–for comparing the variability across datasets when measurements use different units. Coefficient of Quartile Deviation. More examples Example 3: Calculate the range and coefficient of quartile deviation for the following sequence: $1, 2, 4, 4, 6, 9, 9, 9, 10, 100$. If one data set has a larger coefficient of quartile deviation than another data set, then that data set’s interquartile dispersion is greater. If Q3=20 and Q1=10, the coefficient of quartile deviation is: (a) 3 (b) 1/3 (c) 2/3 (d) 1 MCQ No 4.21 Which measure of dispersion can be computed in case of open-end classes? Types of Measures of Dispersion. Absolute Measure: Those measures of dispersion whose units are same as the units of the given series is known as the absolute measure of dispersion.These types of dispersions can be used only in the comparing the variability of the series or distribution having the same units. Gastwirth (1982), "Statistical properties as a measure of tax assessment uniformity", Journal of Statistical Planning Inference, Vol. Co-efficient of Quartile Deviation; Co-efficient of Mean Deviation; Co-efficient of Dispersion. A relative measure of dispersion based on the quartile deviation is called the coefficient of quartile deviation. The quartile deviation calculated from the sample data does not help us to draw any conclusion (inference) about the quartile deviation in the population. Applications: The coefficient of dispersion (COD) is the average difference a group of numbers has from the median. 144-148. The value is reported as a percentage of the median. 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