That is not an easy answer that can be dropped in this space. I have attached some code that does a five parameter logistic regression for a cell based bioassay that might be adaptable, but beware, it is not documented, it does get convoluted, and it was written for v9.1.3.
I hope this will help.
Steve Denham
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ANOVA, or Analysis Of Variance, is used to compare the averages or means of two or more populations to better understand how they differ. Watch this tutorial for more.