Data Preprocessing in Data Mining
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reference: Chapter 3 in book <<Data Mining Concepts and Techniques>>, 3rd Ed by Han, etc.
Data preprocessing techniques aims to improve the quality of pattern mined and/or the time required for mining:
- Data cleaning, which removes noise and correct inconsistencies
- Data integration, which merges multiple data sources into a data store, i.e. data warehouse
- Data reduction, which reduces data size by i.e. aggregating, redundancy reduction, clustering, etc
- Data transformation, which scales data into a smaller range (i.e. normalization to 0 to 1)
The above techniques can work together. Data characteristics, attribute features are useful for these techs.
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