Imbalanced Data - 数据不均衡
# 数据不均衡
2022-06-07
Tags: #DataPreprocessing
什么是数据不均衡
- A classification data set with skewed class proportions is called imbalanced. Classes that make up a large proportion of the data set are called majority classes. Those that make up a smaller proportion are minority classes.
What counts as imbalanced? The answer could range from mild to extreme, as the table below shows.
| Degree of imbalance | Proportion of Minority Class |
|---|---|
| Mild | 20-40% of the data set |
| Moderate | 1-20% of the data set |
| Extreme | <1% of the data set |