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## Quartile Deviation for Ungrouped Data

Quartile deviation or semi-interquartile range is the dispersion which shows the degree of spread around the middle of a set of data. Since the difference between third and first quartiles is called interquartile range therefore half of interquartile range is called...

## Quartile deviation for Grouped Data

Quartile deviation or semi-interquartile range is the dispersion which shows the degree of spread around the middle of a set of data. Since the difference between third and first quartiles is called interquartile range therefore half of interquartile range is called...

## How to Calculate Range in Statistics

Range is defined as the difference between the maximum and minimum values of the data. Although Range is the simplest measure of dispersion and is easy to calculate but it is not a good measure of dispersion because it ignores variation among all other values and...

## Quartiles, Deciles and Percentiles for Ungrouped Data

When data is arranged in ascending or descending order, it can be divided into various parts by different values such as quartiles, deciles and percentiles. These values are collectively called quantiles and are the extension of median formula which divides data into...

## What are Measures of Central Tendency

When a data is collected from a source, it is impractical to keep in mid all values that may be present in a set of data. Therefore a single value which may be considered typical of the set of data should be taken. Central tendency is that single value of the data...

## How to Find Percentiles in Statistics

The data arranged in ascending or descending order can be divided into 100 equal parts by 99 values. These values are called percentiles and denoted by P1, P2,………..P99. There is a slight difference in the calculation of percentiles in case of grouped and ungrouped...
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