This script was written specifically for finding the sum of residue based indicators of quality of a homology model. The actual residue- based properties that are summed can be easilly customized. Currently SAS, pdf-total and pdf-PHPS are measured.
The script should be run from a Discovery Studio script window. The results are printed to the Output section of the script window.
If your interest is antibody loops have a look at the SumAntibodyLoopProperties perl script.