Supplementary Material for
Morris JS, Arroyo C, Coull B, Ryan LM, Herrick R,
and Gortmaker SL
(2005). Using Wavelet-Based Functional Mixed Models to characterize Population Heterogeneity in Accelerometer
Profiles: A Case
Study. Journal of the American Statistical
Association, under revision.
Discussion of technical details of DWT method used in
compute W matrices
(Note: In this paper, these W
matrices were not used to compute the empirical wavelet
coefficients, but rather the pyramid-based DWT, which is
much faster. The reason for this code is to explore
the properties of the transform for various boundary
conditions and approaches for dealing with a non-power of
two. This was used in the document in 2 above.