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{{Short description|Manipulation of data before it is analyzed}}
{{Citations needed|date=August 2023}}
'''Data preprocessing''' can refer to manipulation, filtration or augmentation of data before it is analyzed,<ref>{{Cite web|title=Guide To Data Cleaning: Definition, Benefits, Components, And How To Clean Your Data|url=https://www.tableau.com/learn/articles/what-is-data-cleaning|access-date=2021-10-17|website=Tableau|language=en-US}}</ref> and is often an important step in the [[data mining]] process. [[Data collection]] methods are often loosely controlled, resulting in out-of-range values, impossible data combinations, and [[missing values]], amongst other issues.
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