Thanks, Lida Maybe I need to verify the title. For my data. the independent variable is X, and dependent variable is Y. From literature, the fitting equation for my data is Y=1/[1+A*exp(B*X)], I just want to compare the difference of two group, in my data, that's group 1 and 2. Actually, I am not sure whether my data is logistics regression, but, from the fitting equation, I thought it was. thank you very much.
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