public NetworkMeasure[] newInstances(NetworkData nd) {
   // get blockmodel
   int nSize = nd.getSize();
   NetworkMeasure[] instances = new NetworkMeasure[nSize];
   MeasureParams params = new MeasureParams(TYPE_EXPANSIVENESS);
   for (int i = 0; i < nSize; i++) {
     instances[i] = new IndividualMeasure(params, i);
   }
   return instances;
 }