1. A method of establishing an individual hearing ability model for a person using a representation of a distribution of hearing ability for a population of individuals, the method comprising: obtaining a probabilistic hearing ability model based on the representation of the distribution of the hearing ability for the population of individuals; obtaining information regarding the person's response to a stimulus of a hearing evaluation event; and updating, using a processor, the probabilistic hearing ability model to establish the individual hearing ability model for the person using the information regarding the person's response to the stimulus of the hearing evaluation event, wherein the probabilistic hearing ability model comprises a continuous function.