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 _________________________________________________________________ Hotmail® has ever-growing storage! Don’t worry about storage limits. rial_Storage1_052009 [[alternative HTML version deleted]]
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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