Data Mining, Clustering, and Robust Partial Mixture Estimation Abstract: Mining large datasets successfully requires careful application of statistical modeling tools. Such data are seldom clean and robust statistical methods are especially appropriate to automatically cope with large numbers of outliers. We discuss in particular robust normal mixture estimation. Such models are useful for clustering by associating a cluster with each component of the mixture model. Finally, we present a number of examples including simple regression, robust covariance estimation, incomplete model specification, lightning detection, particle physics detection, and finding the largest eigenvector in a mixture dataset.