NOTE ON A PROBLEM IN PROBIT ANALYSIS
Francis John Anscombe · Annals of Applied Biology · 1949
The statistical treatment of dosage‐mortality data when the number of survivors is counted but not the total number of organisms in each sample, the latter being estimated from an untreated sample, has been discussed by Wadley (1949), on the assumption of Poisson variation in the number of organisms per sample. The procedure to be followed when a wider hypothesis is made that the number of organisms has a negative binomial distribution is described here; both the arithmetical analysis of the results and the optimum arrangement of the samples are considered.