# Optimal ratio for data splitting

“Optimal ratio for data splitting” (2022), by V. Roshan Joseph. Mathematics research paper. Original abstract below, unchanged. A free PDF is available.

- Authors: V. Roshan Joseph
- Published: April 4, 2022
- Field: Mathematics
- DOI: https://doi.org/10.1002/sam.11583
- Free PDF: https://arxiv.org/pdf/2202.03326

## Abstract

It is common to split a dataset into training and testing sets before fitting a statistical or machine learning model. However, there is no clear guidance on how much data should be used for training and testing. In this article, we show that the optimal training/testing splitting ratio is , where is the number of parameters in a linear regression model that explains the data well.

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