Types of Skewness
Broadly speaking, there are two types of skewness: They are (1) Positive skewness and (2) Negative skewnes.
Positive skewness
A series is said to have positive skewness when the following characteristics are noticed:
- Mean > Median > Mode.
- The right tail of the curve is longer than its left tail, when the data are plotted through a histogram, or a frequency polygon.
- The formula of Skewness and its coefficient give positive figures.
Negative skewness
A series is said to have negative skewness when the following characteristics are noticed:
- Mode> Median > Mode.
- The left tail of the curve is longer than the right tail, when the data are plotted through a histogram, or a frequency polygon.
- The formula of skewness and its coefficient give negative figures.
Thus, a statistical distribution may be three types viz.
- Symmetric
- Positively skewed
- Negatively skewed
