Abstract
A program is developed for estimation of median effective dose (ED 50 or LD 50), using the hand-held programmable pocket calculator HP41CV. The well-known Finney's algorithm of probit analysis is used. Input of data is simple, but is restricted to a maximum of 15 groups. The program structure makes use of the technique of indirect addressing for storage, and statistical register manipulation for weighted regression. The ability of the calculator to give sufficiently precise results can be exploited in other similar situations.
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