Re: [R] Restricted 4-PL curves using drc package

The option 2 works. Thanks. Hanna 2015-12-09 16:24 GMT-05:00 Bert Gunter : > 1. Don't know, but, assuming I understand you correctly, probably not. > > 2 Note (subject to my understanding again) that you can rephrase your > query as fitting a 4 parameter logistic to all the data together with >

Re: [R] Restricted 4-PL curves using drc package

1. Don't know, but, assuming I understand you correctly, probably not. 2 Note (subject to my understanding again) that you can rephrase your query as fitting a 4 parameter logistic to all the data together with a grouping factor to indicate the separate curves, allowing two of the parameters (e.g.

[R] Restricted 4-PL curves using drc package

Hi all, In drc package, is there a function which can be used to fit restricted 4PL curves? For example, we restrict two 4PL curves have the same lower and upper asymptotes? Thanks for the help in advance! Hanna [[alternative HTML version deleted]]