Abstract: A second synthetic dataset is generated having internal consistencies with a previously generated first synthetic dataset. The synthetic data of the second dataset can be generated based on a set of rules loaded into a computer data generator for defining entities and interrelationships among events associated with the entities consistent with at least some of the rules previously used for generating the first synthetic dataset. Entities and historical information about the entities within a first observation spanning a first time period can be derived from the first synthetic dataset stored in a computer-readable memory. A second observation window can be established spanning a second time period that is different from the first time period.