For a logistic regression analysis of doses of a drug (measured in mg of drug/kg body mass) in which a = -0.66 and b = 2.8, what would the LD50 be?

Name: For a logistic regression analysis of doses of a drug (measured in mg of drug/kg body mass) in which a = -0.66 and b = 2.8, what would the LD50 be?
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Quizplus · Accepted Answer

The LD50 is the dose at which the probability of response is 0.5. In logistic regression, this occurs when the linear predictor a + b * dose = 0. Solving -0.66 + 2.8 * dose = 0 gives dose = 0.236 mg/kg.

For a Logistic Regression Analysis of Doses of a Drug