create_design_matrix
create_design_matrix(psy_var, phys_var, ppi_var, nuisance_var = NULL)
| psy_var | psy variable data to add to design matrix | 
|---|---|
| phys_var | phys variable data to add to design matrix | 
| ppi_var | ppi variable data to add to design matrix | 
| nuisance_var | nuisance variable data to add to design matrix | 
design matrix
# to be added