[R] nls model parameter compare?

[Jianling Fan]

Hello everyone,

I am doing nonlinear regression using a same sigmoidal model for
different treatments. for each treatment, I got a set of estimated
parameters (a1, b1, c1 for treatment 1; a2, b2, c2 for treatment 2;
a3, b3, c3 for treatment 3). And I want to compare these parameters
for different treatments to see is there any differences? does
estimated parameter for treatment i different from other treatments?

How can I do this analysis please?

Thanks in advance!

Regards,

Julian