March 1, 2022 QUARTILE DEVIATION|Measures of Dispersion|Quantitative techniques|In malayalam|Part 2|

Quartile deviation is based on the difference between the first quartile and the third quartile in the frequency distribution and the difference is also known as the interquartile range, the difference divided by two is known as quartile deviation or semi interquartile range. When one takes half of the difference or variance between the 3rd quartile and the 1st quartile of a simple distribution or frequency distribution is the quartile deviation. A Quartile Deviation (Q.D.) formula is used in statistics to measure spread or, in other words, to measure dispersion. This can also be called a Semi Inter-Quartile Range. Q.D. = Q3 – Q1 / 2 The formula includes Q3 and Q1 in the calculation, which is the top 25% and lowers 25% ,data respectively, and when the difference is taken between these two and when this number is halved, it gives measures of spread or dispersion.