topic Nonlinear inverse prediction in Statistical Procedures

Nonlinear inverse prediction

namodelali — Tue, 06 May 2014 09:03:22 GMT

Hello,

For research purposes, I would like to know the method SAS uses to perform an inverse prediction of confidence interval in the context of a nonlinear model. For exemple for a 4 parameter logistic model(dose response model), whith which method SAS obtains by inverse prediction, the confidence interval of a concentration knowing the corresponding response value? I could not find that information in the SAS documentation.

Thank you.

Re: Nonlinear inverse prediction

StatDave — Thu, 08 May 2014 21:05:35 GMT

Inverse confidence limits in the context of a binary response model (logistic or probit) can be done using the INVERSECL option in PROC PROBIT. The method used is described in the "Details: Inverse Confidence Limits" section of the PROBIT documentation.

Re: Nonlinear inverse prediction

SteveDenham — Fri, 09 May 2014 12:36:56 GMT

Following on to 's comment: There are good methods if you use PROBIT. If you have fit a 4 parameter model in NLIN or NLMIXED, I am afraid that you will have to write DATA step code or PROC IML code to get what you need.

Steve Denham

Re: Nonlinear inverse prediction

namodelali — Fri, 09 May 2014 13:47:47 GMT

Thank you! That helps to find that the methods are there for PROBIT. Since what I am interested in, are growth curves like the 4 parameter model, i will probably write a code with PROC IML to find my inverse confidence interval.

Re: Nonlinear inverse prediction

namodelali — Fri, 09 May 2014 13:48:23 GMT

Thank you.