R help - May 2009 - (no subject)

Could you help me with a problem? I should put non-linear variables into 
zelig-model, how can that be done? I'm dealing with air pollution data, 
trying to find out daily associations between mortality and air pollutants. 
Weather variables used as confounders are in some cases non-linear. Since 
smoothing is not an option I don't know how to proceed.

 

 Thanks, Jaana


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On May 9, 2009, at 5:39 AM, Jaana Kettunen wrote:
>
>
>
> Could you help me with a problem? I should put non-linear variables  
> into
> zelig-model, how can that be done? I'm dealing with air pollution  
> data,
> trying to find out daily associations between mortality and air  
> pollutants.
> Weather variables used as confounders are in some cases non-linear.  
> Since
> smoothing is not an option I don't know how to proceed.
>
>
You should search within the Zelig documentation for examples of  
regression splines. It is not difficult to find these. This document  
has many such examples and it was the first hit on a Google search:
http://gking.harvard.edu/zelig/docs/zelig.pdf


David Winsemius, MD
Heritage Laboratories
West Hartford, CT