Skewness Calculator — Formula
## How to Estimate Skewness
### Pearson's Second Coefficient of Skewness
**Skewness = 3 * (Mean - Median) / Standard Deviation**
- Positive skewness: The right tail is longer; the mean exceeds the median.
- Negative skewness: The left tail is longer; the mean is below the median.
- Zero skewness: The distribution is symmetric.
This is an approximation. The exact moment-based skewness requires raw data.
### Pearson's Second Coefficient of Skewness
**Skewness = 3 * (Mean - Median) / Standard Deviation**
- Positive skewness: The right tail is longer; the mean exceeds the median.
- Negative skewness: The left tail is longer; the mean is below the median.
- Zero skewness: The distribution is symmetric.
This is an approximation. The exact moment-based skewness requires raw data.
Esempio Risolto
A dataset has mean 55, median 50, and SD 10. Estimate the skewness.
- Skewness = 3 * (55 - 50) / 10
- = 3 * 5 / 10
- = 15 / 10 = 1.5
- Positive value indicates right skew