Function takes a design with potentially empty design
variables and rescues the design so that a FIM can be calculated using mftot.
downsizing_general_design(poped.db)A PopED database
A list containing:
A vector of the number of samples in each group.
A matrix of sample times. Each row is a vector of sample times for a group.
A matrix that is the same size as xt, specifying which model each sample belongs to.
A matrix for the discrete design variables. Each row is a group.
A matrix of covariates. Each row is a group.
A matrix of fixed effect parameter values.
Other poped_input: convert_variables,
create.poped.database,
create_design_space,
create_design, poped.choose