Fitting function for function-on-scalar regression for multilevel data. This function estimates model parameters using a VB and estimates the residual covariance surface using FPCA.
vb_mult_fpca( formula, data = NULL, verbose = TRUE, Kt = 5, Kp = 2, alpha = 0.1, argvals = NULL )
a formula indicating the structure of the proposed model.
an optional data frame, list or environment containing the variables in the model. If not found in data, the variables are taken from environment(formula), typically the environment from which the function is called.
logical defaulting to
TRUE -- should updates on progress be printed?
number of spline basis functions used to estimate coefficient functions
number of FPCA basis functions to be estimated
tuning parameter balancing second-derivative penalty and zeroth-derivative penalty (alpha = 0 is all second-derivative penalty)
not currently implemented
Goldsmith, J., Kitago, T. (2016). Assessing Systematic Effects of Stroke on Motor Control using Hierarchical Function-on-Scalar Regression. Journal of the Royal Statistical Society: Series C, 65 215-236.