Programming the statistical procedures from SAS

Nonlinear regression model with complex survey design

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New Contributor
Posts: 2

Nonlinear regression model with complex survey design

Hi to anyone that can help

I have complex weighted survey data and I find that the data best fit a sigmoid curve, like a dose response curve. I am using the complexity of a doctor visit to predict the time that docs spend with patients.

In simplest form, for a linear regression I would use:

Proc surveyreg;

model time=complexity/ clparm adjrsq solution;

weight visitweight;

run;

But, to model a sigmoid response, how should I write the code?

Thanks in advance?

Alan

Respected Advisor
Posts: 2,655

Re: Nonlinear regression model with complex survey design

Hi Alan,

 

I would start by looking through Example 45.18 Weighted Multilevel Model for Survey Data.  This would take into account the survey nature of what is going on.

 

For the response, I would consider rescaling so that the response fell on the open interval (0,1).  Then I would apply a logistic link using a beta distribution.

 

The alternative is a lot of coding in NLMIXED.  You may want to search the stackoverflow and SAS-L archives for approaches.

 

Steve Denham

New Contributor
Posts: 2

Re: Nonlinear regression model with complex survey design

Thanks!!

Alan

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