Assigning individual records or rows in a dataset for specific purposes (eg, model development, model validation) is a process known as:

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Partitioning refers to the assignment of individual records or rows in a dataset for a specific purpose: model development (training, incremental testing of models during development) or model validation (data held out from the development process for the purpose of unbiased performance estimation).

Assigning Individual Records or Rows in a Dataset for Specific