# probit analysis

**probit analysis** A statistical technique used to relate the proportion of subjects responding to the strength of an applied stimulus. The stimulus is often applied in a series of increasing amounts in geometrical progression, and the proportion responding is modeled by the cumulative normal frequency distribution (see probability distributions). The method estimates the *median effective stimulus* or *LD50* and the *slope* of the response. It is widely used in pharmacology, biology, and in testing the safety of products.

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**probit analysis**