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Comparing groups on LD50 estimates from Probit Regression

Question & Answer


Question

I have used the Probit procedure in IBM SPSS Statistics to model the toxicity of a substance. I included a group variable as a factor and the dose level as a covariate. I was able to obtain the LD50 value for each group from the table "Confidence Limits for Effective ', as described in Technote 1480839. However, I would like to compare the LD50 values for each pair of groups and determine whether the LD50 differences are significant. Can the Probit procedure perform these comparisons?

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Modified date:
16 June 2018

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