Provided are processes of balancing between exploration and optimization with knowledge discovery processes applied to unstructured data with tight interrogation budgets. A process may include determining a relevance probability distribution of responses and scores as an explanatory diagnostic. A distribution curve may be determined based on a probabilistic graphical network and a result may be audited relative to the distribution curve to determine noise measurements. The distribution curve may be determined based on a distribution of posterior predictions of entities to score ranking entity bias and noisiness of ranking entity feedback.