A dendrogram is a diagram that displays the arrangement of the clusters formed during hierarchischen Clustering. It visually represents the relationships between various data points or groups, indicating how closely related they are to one another. The branches of the dendrogram illustrate the hierarchy of clusters, with each split indicating a division in the data based on similarity or distance metrics.
Im Kontext von Datenanalyse, dendrograms are frequently used in fields such as bioinformatics, where they help to depict the evolutionary relationships among species, or in market research to identify consumer segmentation. The construction of a dendrogram typically involves algorithms such as agglomerativen Clustering, where individual data points are initially treated as separate clusters and progressively merged based on their similarities until a complete hierarchy is formed.
The y-axis of a dendrogram often represents the distance or dissimilarity between clusters, while the x-axis lists the individual items or groups being clustered. By analyzing the dendrogram, researchers can determine the optimal number of clusters for their data, as well as gain insights into the underlying structure and patterns present within the dataset.