After doing a validation study I repeat it a second time.This time I use a different set of subjects.This is called

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Cross-validation involves using a different set of subjects to validate the results of a study, and is commonly used to ensure the reliability of research findings. Repeated validation refers to repeating a study using the same set of subjects, which may not be as effective as using a different set to ensure the generalizability of results. Validity generalization and selective validation refer to broader concepts related to the validity of assessment procedures across different settings, and are not directly related to the specific situation described in the question.

After Doing a Validation Study I Repeat It a Second