Simon, in your recent reply to me, you noted that EDF=1 corresponds to a 
straight line fit. Does the edf always indicate the polynomial exponent 
directly? We ask because Hothorn and Everitt said "Roughly, the 
complexity of a cubic spline is about the same as a polynomial of degree 
one less than the degrees of freedom." Sorry we attributed the latter to 
you, by the way. Will

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William R. Shadish
Distinguished Professor
Founding Faculty
Chair, Psychological Sciences

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William R. Shadish
University of California
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