Hello,   I have data with a binary response (event, no event) and a continuous dependent variable (e.g. dose). I am interested in the value needed of the dependent variable to achive a probability of response of 30%. I have used the model estimates from proc logistic to identify the point esimtate for the dependent variable (e.g. with my data a dose of 252mg produces a predicted probability of event of 30%). In addition to the point estimate, I am interested in obtaining a 95% confidence interval for this value. Lower= and upper= options in the output statement give the range for the probability at a given dependent variable value. I want the opposite - I want the range for the dependent variable at a given probability. Is that possible? ... View more