Spline smoothing plot

Learn me by follow me exercises

This module applies generalized additive model (GAM) to test the non-linear associations between outcome and exposure. It helps to determine if linear regression is appropriate.

To change the degree of freedom of the smoother, right click the risk factor (X) and then click “Change degree of freedom” from popup menu.  The default (set df=0) uses minimizing GCV method to determine degree of freedom.

Check “Scatter plot original points” if you want scatter plot with a smoothing line.

A screen shot of sample design:

g1_input.gif

Sample output graphs:

  g1_sbp.gif    g1_dbp.gif