Challenges of Outlier Detection
Some challenges in outlier detection:
- Visualization limitations: When dealing with more than two predictor variables, simple visualization tools like scatter plots become less effective in identifying outliers.
- Indirect methods: Unlike linear regression, logistic regression lacks direct outlier detection techniques. It relies on goodness-of-fit and residual analysis, which are primarily used for model assessment.
- Data loss vs. model bias: Removing or downweighting outliers can lead to data loss, potentially discarding valuable information. On the other hand, keeping outliers can introduce bias into the model.
Outlier Detection in Logistic Regression
Outliers, data points that deviate significantly from the rest, can significantly impact the performance of logistic regression models. In this article we will explore various techniques for detecting and handling outliers in Logistic regression.