Then ranking function currently uses only the visible graph for calculating the bounds. That makes comparaison between views difficult because the scale is modified. To address this use case we should have the ability to use ranking on a global scale. A global scale means that the min/max would be computed on the main view rather than on the visible view.

This issue is discussed in this topic:
http://forum.gephi.org/viewtopic.php?f=30&t=1501