What is the difference between classification and regression?

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Classification and Regression are two main types of supervised machine learning tasks, differing in the type of output they predict.

  • Classification → Predicts categories or classes.

    • Output is discrete (e.g., Yes/No, Spam/Not Spam, Red/Blue/Green).

    • Algorithms: Logistic Regression, Decision Trees, Random Forest, SVM.

    • Example: Predicting if an email is spam or not.

  • Regression → Predicts continuous numerical values.

    • Output is continuous (e.g., price, temperature, age).

    • Algorithms: Linear Regression, Ridge Regression, SVR.

    • Example: Predicting house prices based on size and location.

Key Differences:

  1. Output Type: Classification → categories, Regression → numbers.

  2. Evaluation Metrics: Classification → Accuracy, Precision, Recall, F1-score; Regression → MSE, RMSE, R².

  3. Decision Boundary: Classification → separates classes; Regression → fits a continuous function.

In short: Classification answers “Which group?”, while Regression answers “How much?”.

Read More :

Explain linear regression.

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