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
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