It is evident that the stepwise application of these statistical models using only monomer and/or dimer DFT energies results in relatively large errors when calculating the infinite polymer HOMO, LUMO or Eg energy. A drastic reduction in the MAE occurs once the tetramer data is incorporated into the calculation. This analysis suggests that using only monomer energy data to make predictions about the electronic energy of a copolymer would lead to impractically large errors.