The least squares cost function is non-convex in a binary classification setting, meaning the algorithm could get stuck in a local rather than global minimum and thus fail to optimize the loss. In addition, after the logit transformation is applied, the residuals, defined as the difference between the actual and predicted values, would be infinite, since the actual values are only either 0 or 1.
Why are coefficients estimated through Maximum Likelihood (MLE) instead of Least Squares?
- Categories: Logistic Regression
- Updated: March 26, 2023
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