Min-Max-Skalierung, auch bekannt als Min-Max-Normalisierung, is a Technik der Datenvorverarbeitung used to transform features to a specific range, usually between 0 and 1. This method is particularly useful in maschinellem Lernen and statistics bei der Algorithmen empfindlich auf die Skala der Eingabefunktionen reagieren.
Die Formel für die Min-Max-Skalierung lautet:
X' = (X - X_{min}) / (X_{max} - X_{min})wobei:
X'is the scaled value.Xis the original value.X_{min}is the minimum value of the feature in the dataset.X_{max}is the maximum value of the feature in the dataset.
This technique is beneficial because it preserves the relationships between the data points while scaling them to a uniform range. It ensures that each feature contributes equally to the distance calculations in algorithms such as k-nächste Nachbarn (KNN) oder Gradientenabstiegsverfahren.
However, Min-Max Scaling has its limitations. It is sensitive to outliers, which can significantly skew the scaled values if the minimum or maximum values are extreme. In such cases, alternative normalization methods, like Z-score normalization, may be more appropriate. Overall, Min-Max Scaling is a straightforward and effective method for Merkmalskalierung in verschiedenen Data-Science-Anwendungen.