Squared error of regression line

How to Calculate Root Mean Squared Error (RMSE) – Excel and Google Sheets

RMSE: Root Mean Square Error

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Mean Squared Error: Definition and Example

R2 Score & Mean Square Error (MSE) Explained

Curve fitting is a fundamental concept in data analysis and machine learning, where the objective is to identify a mathematical function that best represents or approximates a set of observed data points. The chosen function can take many forms - linear, polynomial, exponential, or even nonlinear models like those used in neural networks, depending on the complexity of the underlying relationship. The core challenge lies in reducing the gap between the actual data points and the predicted curve.

Mean Squared Error in Python - GeeksforGeeks