Fitting multiple nonlinear regression on different subjects with repeated mesurements simultaneouly

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Fitting multiple nonlinear regression on different subjects with repeated mesurements simultaneouly

juan suarez
How do I run a nonlinear regression in R? I have a set of k observations for each of n participants, with the objective of fitting a nonlinear function to the data of each participant in order to save the parameter estimates for subsequent analysis and plotting the regression curve on the data. (See dataset image here: bioassay data.)
For example in bioassay analysis I want to fit concentration vs time by groups at several time periods by using the defined-function concentration = (a*time)/(b+time).
here is the datasetbioassay dataset
thank you!
juan