The middle of a cluster. A centroid is a vector that contains one number for each variable, where each number is the mean of a variable for the observations in that cluster. The centroid can be thought of as the multi-dimensional average of the cluster.
Use the cluster centroid as a general measure of cluster location and to help interpret each cluster. Each centroid can be seen as representing the "average observation" within a cluster across all the variables in the analysis.
Minitab calculates the distances between the centroids of the clusters that are included in the final partition. For each cluster, Minitab also calculates various distance measures between the cluster centroid and the observations within the cluster. For more information, see the topic for each distance measure.