Electron microscopy
 
PythonML
Evaluation (Precision and Recall) in Text classification with Naive Bayes
- Python Automation and Machine Learning for ICs -
- An Online Book -
Python Automation and Machine Learning for ICs                                                           http://www.globalsino.com/ICs/        


Chapter/Index: Introduction | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Appendix

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Due to the Precision and Recall Tradeoff, the choice between emphasizing precision or recall in text classification with Naive Bayes depends on the specific goals and requirements of the application:

  1. Precision Emphasis: 

    If the cost or consequences of false positives (misclassifying a non-relevant document as relevant) is high, we might want to emphasize precision. 

    For example, in spam email detection, we want to avoid classifying important emails as spam (false positive). 

  2. Recall Emphasis: 

    If the cost or consequences of false negatives (missing a relevant document) is high, we might want to emphasize recall. 

    For example, in information retrieval or medical document classification, we want to capture as many relevant documents as possible, even if it means accepting some false positives. 

  3. Balanced Approach: 

    In some cases, a balanced approach considering both precision and recall might be suitable. F1 score, which is the harmonic mean of precision and recall, is a metric that combines both aspects. 

Naive Bayes is a probabilistic model that makes independence assumptions, and its decision threshold can be adjusted to impact precision and recall. Experimenting with different thresholds and evaluating the model's performance using precision, recall, and possibly F1 score can help us determine the tradeoff that aligns with the application's goals. 

 

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