A computer implemented method, apparatus, and computer usable program code for inferring a probability of a first inference absent from a database at which a query regarding the inference is received. Each datum of the database is conformed to the dimensions of the database. Each datum of the plurality...http://www.google.ca/patents/US7788202?utm_source=gb-gplus-sharePatent US7788202 - System and method for deriving a hierarchical event based database optimized for clinical applications