'Site S-shaped curve in R with a fixed probability one one data point
I am looking to plot an s-shaped curve (logistic curve) where one of the x-axis points has a probability of 30%. I don't have data, I am just looking to plot this.
I have the doses below, and I would like to fit a logistic curve where dose 400 corresponds to 30% efficacy probability.
Dose -> c(100, 200, 400, 800, 1600, 3200)
Is there an easy way to do this? I apologize, this might be a simple question but I am not seeing how I can plot what I need. Thank you.
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