2018. 1. 10. 16:22 Machine Learning
Major tasks in data preprocessing
Major tasks in data preprocessing
1. Data cleaning
- Fill in missing values
- smooth noisy data, identify of remove outliers
- resolve inconsistenciies
2. Data integration
- integration of multiple databases, data cubes, or files
- Need to handle data redundancy (e.g. chi-square test, correlation analysis)
3. Data reduction
- Dimensionality reduction
- Numerosity reduction (Sampling)
- Data compression
4. Data transformation
- Normalization
- Discretization or Binning
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